Calculate the hydronium ion concentration in an aqueous solution with a poh of 9. 85 at 25°c.
Answers
The hydronium ion concentration in the given aqueous solution is 7.08 x 10⁻⁵ M.
The pOH of the aqueous solution is 9.85.
We can find the pH by subtracting the pOH from 14
pH = 14 - pOH= 14 - 9.85= 4.15
Now that we have the pH, we can find the hydronium ion concentration by taking the antilog of the negative pH value
[H₃O+] = antilog(-pH)= antilog(-4.15)= 7.08 x 10⁻⁵ M
Therefore, the hydronium ion concentration in the given aqueous solution is 7.08 x 10⁻⁵ M.
Thus, the hydronium ion concentration in the given aqueous solution is 7.08 x 10⁻⁵ M.
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Related Questions
When 3-methyl-2-butanone undergoes a baeyer-villiger oxidation reaction, the product is:_____.
Answers
When 3-methyl-2-butanone undergoes a baeyer-villiger oxidation reaction, the product is isopropyl acetate and methyl isobutyrate.
The Baeyer-villiger oxidation would seem to be a chemical reaction that uses peroxy acids using peroxides as the oxidant to transform a ketone into an ester or a lactone from such a cyclic ketone.
The main product produced by the Baeyer-Villiger oxidation of camphor using m-CPBA in buffer conditions could be created as a result of the migration of a tertiary bridgehead carbon as opposed to a methylene group.
By the reaction between 3-methyl-2-butanone with m-CPBA , will form isopropyl acetate and methyl isobutyrate.
It reaction can be shown as:
Therefore, when 3-methyl-2-butanone undergoes a Baeyer-villiger oxidation reaction, the product is isopropyl acetate and methyl isobutyrate.
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Comment on the following statement: when two gases are mixed, if they are to be in thermal equilibrium, they must have the same average molecular speed. is the statement correct? why or why not?
Answers
when two gases are mixed, if they are to be in thermal equilibrium, they must have the same average molecular speed" is incorrect.
In thermal equilibrium, gases do not necessarily have to have the same average molecular speed. Instead, they should have the same temperature. Temperature is related to the average kinetic energy of the molecules, which includes their speed. However, it is possible for gases with different average molecular speeds to have the same temperature, as long as their average kinetic energy is equal.
Therefore, thermal equilibrium is determined by temperature, not average molecular speed.
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chemistry has no role in solving the problems of mankind true or false
Answers
Scientist repeats an experiment and gets a
different result. What should the scientist do next
Answers
Answer:
tty to fin out what happend by redoing it
i have molars with pointy cusps and a simple digestive system. what type of diet do i have? a. insectivorous b. gummivorous c. frugivorous d. folivorous
Answers
Frugivores have molars with pointed cusps and a simple digestive system that allows them to consume and digest large quantities of fruit, while their bodies extract and process the nutrients they require. Therefore, the right answer is option C. frugivorous.
If you have molars with pointy cusps and a simple digestive system, you have a frugivorous diet. A frugivorous animal is one whose diet is mainly composed of fruits, sometimes supplemented with leaves, stems, and other plant matter. They usually have molars with pointy cusps and a simple digestive system.Frugivorous animals are animals that primarily eat fruit, but they may also eat leaves, flowers, and insects. In comparison to carnivores or herbivores, frugivores have a simpler digestive system.Frugivores have molars with pointed cusps and a simple digestive system that allows them to consume and digest large quantities of fruit, while their bodies extract and process the nutrients they require. Therefore, the right answer is option C. frugivorous.
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the lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness was analyzed using flame emission spectroscopy. a sample of the serum gave a reading of 388 units for the intensity of the 671 nm red emission line. then, 1.00 ml of a 11.2 mm lithium standard was added to 9.00 ml of serum. this spiked serum gave an intensity reading of 879 units at the 671 nm emission line. what is the original concentration of li in the serum?
Answers
The original concentration of the \(Li^{+}\) calculated is 0.99 m M when a sample of the serum which gave a reading about the 388 units for the intensity of the 671 nm of the red emission light.
We have to determine the original concentration of the \(Li^{+}\) in serum from the given sample.
initial concentration, I(x) = 484
484 = k [\(Li^{+}\)]
The initial concentration of the lithium ion + the standard of concentration
=> I (x + s) = 978
=> 978 = k x { [\(Li^{+}\) standard] * (V standard/ V total) } +k { [\(Li^{+}\) serum] * (V initial/ V total) }
=> 484 = k*[\(Li^{+}\) serum],
=> 978 = k x { [11.1] * (1 mL/ 10 mL) } + 484 x (9 mL/ 10 mL)
k = 488.65
484 = 488.65 x [\(Li^{+}\)]
[\(Li^{+}\)] = 0.99 m M
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describe the temperature, moisture and air pressure associated with a continental polar air mass.
Answers
The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.
Continental polar air mass -Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.
During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.
These factors contributed to the polar air mass:
Breezeextreme humiditythe evening's low temperatureDuring the colder months of the year, continental polar air typically forms over vast land masses.
A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.
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IF 14.07*10^26 molecules of magnesium chloride was produced in the following reaction, how many grams of magnesium reacted?
Answers
Answer:
56160grams
Explanation:
First, we need to convert the number of molecules of magnesium chloride (MgCl2) into moles by dividing by Avagadro's number (6.02 × 10^23 molecules)
n = nA ÷ 6.02 × 10^23
n = 14.07 × 10^26 ÷ 6.02 × 10^23
n = 14.07/6.02 × 10^(26-23)
n = 2.34 × 10^3 moles of MgCl2
The balanced reaction given in the question is as follows:
Mg + 2HCl → MgCl2 + H2
If 1 mole of Mg produced 1 mole of MgCl2
Then, 2.34 × 10^3 moles of Mg will also produce 2.34 × 10^3 moles of MgCl2.
Using mole = mass ÷ molar mass (MM)
Molar mass of Mg = 24g/mol
mass = mole × MM
mass = 2.34 × 10^3 × 24
mass = 56.16 × 10^3
mass = 56160grams.
When I worked in a pharmacy, I was shocked when the pharmacy sold 600 mg pills of Ibuprofen for about $1 per pill, while the 200 mg pills of the same medicine for about 4 cents a pill. The 600 mg pills required an prescription from a doctor, while 200 mg pills were OTC. I asked the pharmacist why was there a 830% price increase on the same medicine that required prescription vs. OTC. His response was that people are willing to pay more what they cannot get OTC. Class,
Answers
Consumer behavior can be explained by the concept of perceived value and the principles of supply and demand.
Consumers are willing to pay more for a product or service when they perceive it to have higher value or when it is more difficult to obtain. In the case of the 600 mg pills of Ibuprofen requiring a prescription, their restricted availability creates a perception of higher value and exclusivity. This perception can lead consumers to believe that the higher-priced product is more potent or effective.
Additionally, the requirement of a prescription adds a layer of authority and professional recommendation, which further influences the perceived value of the product. Consumers may associate the need for a prescription with a higher level of care, expertise, and safety.
The lower price of the 200 mg OTC pills reflects their wider availability and ease of access, making them more affordable and appealing to a larger consumer base. Overall, the price difference between the two variants of Ibuprofen can be attributed to the interplay between perceived value, supply, and demand dynamics in the market.
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the complete question is:
When I was a pharmacy employee, I was surprised to see that the 600 mg pills of Ibuprofen cost nearly $1 each, while the 200 mg pills of the same medication cost only about 4 cents each. While 200 mg pills were over-the-counter, the 600 mg pills required a prescription from a doctor. I questioned the chemist as to why the same medication's cost had increased by 830% between prescription and over-the-counter versions. People are willing to spend more for something they can't obtain over-the-counter, he said in response. How can such consumer behaviour be justified, class?
The Liquified Petroleum Gas (LPG) has the composition of 60% Propane (C 3
H 8
) and 40% Butane (C 4
H 10
) by volume: (a) Find the wet volumetric and gravimetric analysis of the products of combustion when the equivalence ratio (Φ)=1.0. (b) What is the stoichiometric air to fuel ratio for the LPG.
Answers
The balanced combustion reaction for propane can be represented as:
C₃H₈ + (5/2)O₂ → 3CO₂ + 4H₂O
And the balanced combustion reaction for butane can be represented as:
C₄H₁₀ + (6.5)O₂ → 4CO₂ + 5H₂O
Since LPG is composed of 60% propane and 40% butane by volume, we can calculate the wet volumetric and gravimetric analysis based on these proportions.
Wet volumetric analysis:
For the wet volumetric analysis, we consider the volume of the products of combustion relative to the volume of the LPG consumed.
Propane (C₃H₈):
The stoichiometric coefficient of propane in the combustion reaction is 3. Therefore, for every mole of propane burned, we will have 3 moles of CO₂ and 4 moles of H₂O formed.
Butane (C₄H₁₀):
The stoichiometric coefficient of butane in the combustion reaction is 4. Therefore, for every mole of butane burned, we will have 4 moles of CO₂ and 5 moles of H₂O formed.
Considering the initial composition of 60% propane and 40% butane by volume, we can calculate the volumetric composition of the products of combustion:
Volumetric composition of CO₂:
(0.6 * 3) + (0.4 * 4) = 3.6
Volumetric composition of H₂O:
(0.6 * 4) + (0.4 * 5) = 4.6
Therefore, the wet volumetric analysis of the products of combustion is 3.6 parts CO₂ to 4.6 parts H₂O.
Wet gravimetric analysis:
For the wet gravimetric analysis, we consider the mass of the products of combustion relative to the mass of the LPG consumed.
Using the molar masses of the compounds involved in the combustion reaction:
Molar mass of CO₂ = 44 g/mol
Molar mass of H₂O = 18 g/mol
Gravimetric composition of CO₂:
(0.6 * 3 * 44 g/mol) + (0.4 * 4 * 44 g/mol) = 158.4 g
Gravimetric composition of H₂O:
(0.6 * 4 * 18 g/mol) + (0.4 * 5 * 18 g/mol) = 74.4 g
Therefore, the wet gravimetric analysis of the products of combustion is 158.4 grams CO₂ to 74.4 grams H₂O.
(b) The stoichiometric air to fuel ratio for LPG can be determined based on the balanced combustion equations for propane and butane.
For propane (C₃H₈):
C₃H₈ + (5/2)O₂ → 3CO₂ + 4H₂O
The stoichiometric coefficient for propane is 1, which means we need 5/2 moles of O₂ for every mole of propane.
For butane (C₄H₁₀):
C₄H₁₀ + (6.5)O₂ → 4CO₂ + 5H₂O
what organ from a a jelly fish is like a human brain
Answers
Answer:
Below:
Explanation:
Instead of a single, centralized brain, jellyfish possess a net of nerves. This “ring” nervous system is where their neurons are concentrated—a processing station for sensory and motor activity. These neurons send chemical signals to their muscles to contract, allowing them to swim.
Hope it helps...
It's Muska
The total kinetic and potential energy of the particles that make up a substance is the _____ of that substance.
Answers
The total kinetic and potential energy of the particles that make up a substance is the thermal energy of that substance.
The overall kinetic energy of something like the particles in a substance is measured by its thermal energy. The temperature, as well as thermal energy substantially increase with particle mobility. The total thermal energy of such a substance is a function of temperature, atomic number, and physical condition.
Regardless of whether the temperature rises or falls, the kinetic energy continuously rises. The molecules' kinetic energy rises as the temperature rises.
Therefore, The total kinetic and potential energy of the particles that make up a substance is the thermal energy of that substance.
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a repelling force occurs between two charged objects when the charges are
Answers
Answer:
Like signs.
Explanation:
When two charges are like signs, a repelling force will occur.
I need help with this question
Answers
Answer: permeable and porous
Explanation: piezometers are special monitoring bores that are used to monitor regional groundwater levelsCalculate the velocity of a mountain climber who is moving northeast at a pace of 1.6 km in 1.4 hours. Use the FACTOR LABEL method to convert your answer to meters per second (m/s)
Answers
\(\\ \tt\Rrightarrow Velocity=\dfrac{Distance}{Time}\)
\(\\ \tt\Rrightarrow Velocity=\dfrac{1.6}{1.4}\)
\(\\ \tt\Rrightarrow Velocity=8/7=1.1km/h\)
Answer:
velocity = 0.3175 m/s
Explanation:
given:
1.6 km1.4 hoursconversion:
1 km ↔ 1000 m
1.6 km ↔ 1600 m
and
1 hours ↔ 3600 seconds
1.4 hours ↔ 5040 seconds
The distance is 1600 m and time is 5040 seconds. this was done as velocity is asked as * m/s *
solve:
\(velocity = \dfrac{distance}{time}\)
\(velocity = \dfrac{1600}{5040}\)
\(velocity = 0.3175\)
Calculate the number of molecules in 200g of nitrogen gas.
Answers
Answer:
14.278880821321199
Explanation:
i believe this is the answer correct me if I'm wrong
Calculating volume (formula) and density of regular shaped objects
Please help I need to complete this assignment fast :( I’m not sure on how to do it, If you don’t know how to do it don’t answer pls
Answers
The density of the unknown sample is 1.025 g / mL and its salt composition is 3.55 %.
How to solve
PART A: Density of a regular shaped object:
Trial 1: mass of the object = 162.20 g
volume of object = L x H x W = 4.90 cm x 3.90 cm x 2.90 cm
= 55.419 cm^3
Therefore density of the object = mass / volume = 162.20 g / 55.419 cm^3
= 2.9268 g/cm^3
trial 2: mass of the object = 162.18 g
volume of object = L x H x W = 4.89 cm x 3.90 cm x 2.88 cm
= 54.92448 cm^3
Therefore density of the object = mass / volume = 162.18 g / 54.92448 cm^3
= 2.9528 g/cm^3
Average = [ 2.9268 + 2.9528 ] /2 = 5.8796 / 2 = 2.9398 g / cm^3 = 1.94 g / cm^3.
The accepted value is 2.73 g / cm^3 for aluminium. The difference is 0.21
% error = 100 x difference / accepted value = 100 x 0.21/2.73 = 7.7 %.
---------------------------------------------------------------------------------------------------
Part B: Determination of density of an irregular shaped object:
Trial 1:
mass of the marble chips = 10.25 g
Volume of the marble chip = final volume of water - initial volume of water
= 53.8 - 50 = 3.8 mL
Therefore density of marble chip = mass / volume = 10.25 g / 3.8 mL
= 2.697 g / mL
Trial 2:
mass of the marble chips = 10.32 g
Volume of the marble chip = final volume of water - initial volume of water
= 53.9 - 50.1 = 3.8 mL
Therefore density of marble chip = mass / volume = 10.32 g / 3.8 mL
= 2.716 g / mL
Average = [2.697 + 2.716] / 2 = 5.413 / 2 = 2.71 g / mL
The accepted density of marble chip = 2.70 g / mL The difference is 0.01
% error = 100 x difference / accepted value = 100 x 0.01/ 2.70 = 0.37 %.
--------------------------------------------------------------------------------------------------------------------
PART C: Determination of density of saline solution:
Trial 1:
Volume of the saline solution = 10 mL
mass of the saline solution = finall mass - initial mass
= 35.66 - 25.36 = 10.3 g
Density of the saline solution = mass / volume = 10.3 g / 10 mL = 1.03 g / mL
Trial 2:
Volume of the saline solution = 10 mL
mass of the saline solution = finall mass - initial mass
= 35.55 - 25.35 = 10.2 g
Density of the saline solution = mass / volume = 10.2 g / 10 mL = 1.02 g / mL
Average =[ 1.03 + 1.02 ] / 2 = 1.025 g / mL
Thus the unknown sample B has the density of 1.025 g / mL.
The composition of salt in this solution can be determined by interpolation.
salt % = 0 + 5 x [ 1.025-0.998] / [1.036 - 0.998] ( using the values given in the table )
= 0 + 5 x 0.027 / 0.038
= 3.55 %.
Thus the density of the unknown sample is 1.025 g / mL and its salt composition is 3.55 %.
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SOMEONE HELP ME PLEASE
Answers
Answer:
Convert the 60 and round it up with how ever many bars are above the 60
sorry if this doesnt help
Explanation:
Explanation: After the bolded line (for 60°) the little lines count as 2.. 62,64,66, and the one that the red line reaches up to is 68
What volume (in L) of carbon dioxide will be produced from the reaction of 37.4 L of oxygen?
Answers
Answer:
Maybe somewhere close to 12 L?
During secondary active transport, the movement of one substance down its electrochemical gradient provides the force to move another substance up its electrochemical gradient. When both substances move in the same direction the mechanism is referred to as a(n)
Answers
Given what we know about the mechanisms surrounding the biological movement of substances, we can confirm that when two substances in a secondary active transport move in the same direction, it is called a symport.
A secondary active transport harnesses the electrochemical energy generated by its movement of one substance, to aid the movement of the other. These movements can be of two types, depending on the directions:
AntiportSymportAn antiport transport will move both substances in opposite directions, meaning one out of the cell and one into the cell. The transport described in the question is that of a symport, given that it moves both substances in the same direction.
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A positive test for sure hydrolysis is a yellow color due to pH changes in the medium Thue F The congue legats per gested for 15 minutes after incubation
Answers
The term that is defined as the entire set of surrounding parts of the world with which the user interacts is the "user interface."
The user interface (UI) encompasses all the elements and components through which a user interacts with a system, software, or device. It includes visual, auditory, and tactile elements that enable users to input commands, receive feedback, and navigate through the system or application. The user interface plays a crucial role in facilitating effective communication between the user and the underlying technology.
The user interface is responsible for presenting information, options, and controls in a way that is intuitive, user-friendly, and responsive. It includes various elements such as menus, buttons, forms, icons, screens, and dialog boxes, all designed to enable users to interact with the system and accomplish their tasks efficiently. The user interface design focuses on creating a seamless and engaging user experience by considering factors like usability, accessibility, and visual aesthetics.
The goal of a well-designed user interface is to ensure that users can easily understand and navigate the system, perform desired actions, and receive appropriate feedback. It involves considering user expectations, mental models, and providing clear and concise instructions or cues. By creating an intuitive and responsive user interface, developers can enhance user satisfaction, productivity, and overall user experience.
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taking into account which direction the meter points, what is being reduced and what is being oxidized in the zinc and copper galvanic cell?
Answers
Taking into account the direction the meter points will be from left to right, the copper (||) ions are being reduced and Zn is being oxidized in the zinc and copper galvanic cell.
The direction of the flow of elections will be indicated by the direction of the needle, which will move from left to right. At this point, oxidation takes place at the Zn electrode, resulting in the release of e-, whilst the reduction of Cu+2 ion takes place at the Cu electrode, leading to the movement of electrons from left to right.
The correct answer is that the copper (||) ions are being reduced while the zinc ions are being oxidized.
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will mark brainliest question in the picture
Answers
Answer:
The correct answer is, D. growing in size
Using the periodic table, predict whether the following chlorides are ionic or covalent: SiCl4, PCl3, CaCl2, CsCl, CuCl2, and CrCl3.
Answers
The following chlorides are ionic or covalent:
SiCl₄ = covalent
PCl₃ = covalent
CaCl₂ = ionic
CsCl = ionic
CuCl₂ = ionic
CrCl₃ = ionic
SiCl₄ is silicon tetrachloride. SiCl₄ is a covalent. The bond between silicon and chlorine is formed by the sharing of electrons.
PCl₃ is Phosphorous trichloride . PCl₃ is covalent. Phosphorus contain 5 electrons in valence shell and requires 3 more to complete octet and chlorine require one electron to complete octet so, the bond formed is by sharing of electron.
CaCl₂ is calcium chloride. CaCl₂ is an ionic. calcium is metal and metal donates electron to chlorine is non metal and non metal accept electrons and become Ca²⁺ and Cl⁻. The bond formed by the transfer of electrons.
CsCl is cesium chloride. CsCl is an ionic. symbol of ions : Cs⁺ and Cl⁻
CuCl₂ is copper(II) chloride. CuCl₂ is ionic formed by the transfer of electrons. symbol of ions : Cu²⁺ and Cl⁻
CrCl₃ is chromium(III) chloride. CrCl₃ is an ionic. symbol of ions : Cr³⁺ and Cl⁻.
Thus, The following chlorides are ionic or covalent:
SiCl₄ = covalent
PCl₃ = covalent
CaCl₂ = ionic
CsCl = ionic
CuCl₂ = ionic
CrCl₃ = ionic
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Write the expressions for the equilibrium constants of the reactions below.
a.N2 () + 3H2 () ⇌ 2NH3 ()
b. Br2 () + H2 () ⇌ 2HBr ()
c.CO () + H2O () ⇌ H2 () + CO2 ()
Answers
Answer:
Hey Man I dont know the Answer Im really sorry
Explanation:
I took the test though
WHat is the defination of Eukaryote
Answers
Answer:
an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus. Eukaryotes include all living organisms other than eubacteria and archaebacteria.
Explanation:
you could have just looked it up yourself on go.ogle but thx for the points!
how does a tiny seed turn into a tree overtime?
Answers
Answer:
A group of cells ready to form roots a stem and the first leaves
How much heat is roguired to raise the temperature of 8.75 g of water from its melting point to its boiling pointsExpress your answer numerically in kilojoulos,
Answers
The heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.
What exactly is specific heat?The amount of heat required to increase the temperature of one gram of a material by one degree Celsius (°C) is defined as specific heat.
What is the name of the specific heat formula?The equation q = mcΔt can be used to compute the amount of heat acquired or lost by a specific heat (q), where m is the mass of the sample, c is the specific heat, and Δt is the temperature change.
Given:
m = 8.75
c = 4.186 J/g°C
The melting point and boiling point of water is 0° and 100° respectively.
Δt = 100° - 0° = 100°
We know that,
q = mcΔt
= 8.75(4.186)100
= 3.662 kJ
Thus, the heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.
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You're paid $25 per hour for your job. How much would you earn in cents per second?
Answers
Answer:
0.694 cents per second
Explanation:
25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second
The potential difference between the top and bottom of a D cell battery is
Answers
Answer:
Does it have a picture?
Explanation:
The potential difference between the top and bottom of a D cell battery is derived by the use of a voltmeter between the +ve and -ve poles.
What is the Potential difference?The potential difference is simply defined as two points that reflect the energy released in transferring a unit quantity of electricity from one spot to the other.
In conclusion, Potential difference is also known as the voltage across two points in a circuit.
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