the ka for an acid is 2.41e-5. the buffer is composed of 7.94 mmoles of the weak acid and 9.27 mmoles of its conjugate base for a total volume of 55.03 ml. what is the ph?
Answers
The pH of the buffer solution is 4.77 when the ka for an acid is \(2.41^e^-^5\) .
To calculate the pH of the buffer solution, you can use the Henderson-Hasselbalch equation:
pH = \(pK^a + log ([A^-]/[HA])\), where [\(A^-\)] is the concentration of the conjugate base and [HA] is the concentration of the weak acid.
1. Convert the given \(K^a\) value to \(pK^a\):
\(pK^a = -log(K^a)\) = \(-log(2.41^e^-^5)\)= 4.62
2. Calculate the concentrations of the weak acid and its conjugate base:
[HA] = moles of weak acid / volume = 7.94 mmol / 55.03 mL
= 0.144 M
[\(A^-\)] = moles of conjugate base / volume = 9.27 mmol / 55.03 mL
= 0.168 M
3. Plug these values into the Henderson-Hasselbalch equation:
pH = 4.62 + log (0.168/0.144) = 4.62 + 0.15 = 4.77
Therefore, The pH of the buffer solution is 4.77.
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Related Questions
Name the types of chemical bonds that link:
a. Adjacent amino acids in the a protein.
b. An amino acid to tRNA.
c. Adjacent nucleotides in RNA.
d. A codon in mRNA to an anticodon in tRNA.
e. The two subunits of a ribosome.
Answers
The type of chemical bond that link:
A-Adjacent amino acids in the protein is peptide bond
B-An amino acid to tRNA is ester bond
C-Adjacent nucleotides in RNA is a chain of bonds called ester bonds
D-A codon in tRNA to an anticodon in mRNA is hydrogen bond
E-Two subunits of a ribosome are attached by 12 canonical intersubunit bridges
A- Peptide bond is formed by a biochemical reaction which releases a water molecule joining the amino group of one amino acid with the carboxyl group of adjacent amino acid.
B- The ester bond connects the carboxyl group of amino acid and terminal 3'OH - group of tRNA.
C- DNA and RNA consists of nucleotides . These nucleotides are connected with each other with a chain of bonds called ester bonds. These join the sugar base of one nucleotide to the phospate group of another nucleotide.
D- The nitrogenous bases in codon and anticodon are bonded together by hydrogen bonds.
E-The 12 canonical intersubunit bridges or bonds are formed between rRNa and rRNA , rRNA and protein and protein and protein components.
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Which process causes Earth’s surface to warm?
Answers
Answer:
The radiation of the Sun's electromagnetic waves
Explanation:
Earth's atmosphere keeps much of the Sun's energy from escaping into space. This process, called the greenhouse effect, keeps the planet warm enough for life to exist.
Calculate the number of moles in 0.48 g of Cu.
Answers
1) Convert grams to moles
The molar mass of Cu is 63.546 g/mol.
\(molCu=0.48gCu\cdot\frac{1molCu_{}}{63.546gCu_{}}_{}=0.007553molCu\)0.007553 mol of Cu is equal to 7.6*10^-3 mol of Cu.
.
Consider a 100-gram sample of radioactive cobalt-60.
How much time will it take before half the sample has decayed?
Answers
It will take 5.2 years to decay.
The half life of cobalt-60 is 5.2 years. The half life is the time taken for the mass of the substance to decrease by a half.
here, the amount of remaining substance is 50%,
so, \((\frac{1}{2} )^{n} = 0.5\)
n. log (0.5) = log (0.5)
n = 1
So it would take 1 half lives to decay this much, which is 1 x 5.2 which is 5.2 years.
what do you mean by radioactive decay ?
The process through which an unstable atomic nucleus loses energy via radiation is known as radioactive decay, also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration. A material that has unstable nuclei is considered as radioactive.
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Students conduct an experiment:
They placed Vinegar in a bottle and Baking Soda in a ballon...
They then placed the ballon on the bottle and proceeded to drop the baking soda into the bottle.
The students drew the following:
EXPLAIN BELOW THE PICTURE WHAT KIND OF CHANGE DID THEY OBSERVE AND THE PROOF.
Your answer:
Answers
Answer:
The balloon becomes inflated
Explanation:
The equation of the reaction between baking soda (sodium bicarbonate) and vinegar(ethanoic acid) is shown below;
NaHCO3 + HC2CH3O2 ------> NaC2H3O2 + H2O + CO2
The gas (CO2) evolved in the process leads to the inflation of the balloon dropped on the bottle in which the reaction is taking pace.
This observation provides evidence that a gas was really evolved in the reaction.
CHEMISTRY HELP NEEDED
Why is critical mass important for a fission chain reaction?
- it keeps the neutrons from escaping the sample
- it keeps neutrons from being absorbed by other isotopes
- it allow neutrons to e absorbed by other fissionable nuclei
- it provides enough fuel to make enough energy
Why is a moderator important for a fission chain reaction?
- it keeps the neutrons from escaping the sample
- it keeps neutrons from being absorbed by other isotopes
- it allow neutrons to e absorbed by other fissionable nuclei
- it provides enough fuel to make enough energy
Why is enrichment important for a fission chain reaction?
- it keeps the neutrons from escaping the sample
- it keeps neutrons from being absorbed by other isotopes
- it allow neutrons to e absorbed by other fissionable nuclei
- it provides enough fuel to make enough energy
Answers
1. We can see here that critical mass is important for a fission chain reaction because: C. It allow neutrons to be absorbed by other fissionable nuclei.
What is fission chain reaction?Fission chain reaction is a self-sustaining reaction in which the splitting of atomic nuclei of a particular material, such as uranium or plutonium, releases a large amount of energy in the form of heat and radiation.
2. A moderator is important for a fission chain reaction because: A. it keeps the neutrons from escaping the sample.
3. Enrichment is important for a fission chain reaction because: D. it provides enough fuel to make enough energy.
A moderator is important for a fission chain reaction because it slows down the fast-moving neutrons, making them more likely to be absorbed by other fissionable nuclei and sustain the chain reaction. Without a moderator, the neutrons would move too quickly to be efficiently absorbed.
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What ideas do you have about what makes Anchorage, Alaska, cooler than Christchurch, New Zealand?
-science
Answers
Answer:
You can explore a variety of things in Alaska. There are so many activities you could do such as visiting museums and hiking and tons more. The thing about this is that it is out in the wilderness which makes it more exciting and cooler to see nature more than it does in new zealand. The climate can be pretty chilly in Alaska but it is way much fun to see tons of glaciers. New zealand has eathquakes frequently whilst Alaska doesn't.
does carbon dissolve in water
Answers
Answer:
yes
Explanation:
CO2 is soluble because water molecules are attracted to these polar areas. The bond between carbon
can someone answer this for me and show proof I WILL MARK BRAINLIEST
the answers : A. sugars to oxygen and water B. oxygen and water to sugars C. carbon dioxide and water to sugars D. sugars to water and Carbon dioxide I WILL REPORT YOU IF YOU ANSWER FOR POINTS!!! DON'T ANSWER IF YOU DON'T KNOW!!! comment only if you not sure I WILL REPORT YOU
Answers
Answer:
A
Explanation:
Caus it makes sense
Why is it incorrect to refer to a molecule of sodium chloride? a. Because sodium and chloride are not bonded together in any way. b. Because ionic compounds do not exist in discrete molecules--they exist in crystal lattices. c. Because molecules are not a meaningful term in chemistry. d. Because sodium chloride is not a compound found in nature.
Answers
Answer:
B. Because ionic compounds do not exist in discrete molecules -- they exist in crystal lattices.
Explanation:
A property of ionic compounds is that they form crystal lattice structures. Ionic compounds are crystals of many cations and anions bonded together. There is no molecule of ionic compounds because there is no single unit of the compound.
Hope this helps.
If a substance begins with 64 atoms of radioisotope,how many will remain after two half-lives 
Answers
when water changes from solid to liquid, the h2o particles present in the solid form become h2o particles in the liquid form. during this process there is in the chemical composition of the substance. this is defined as a(n) change.
Answers
Because HNO3 is a potent acid, it totally ionizes to produce the H+ and NO3- ions. Phenolphthalein's base color is pink, while its acid color is less colorful. ·
Which of the following describes hno3's characteristics?Nitric acid (HNO3) is an industrial chemical used in the production of fertilizers and explosives. It is a colorless, fuming, and extremely corrosive liquid with boiling and freezing points of 83 and 42 degrees Celsius, respectively. It is poisonous and can result in serious burns.
HNO3 undergoes what kind of reaction?Neutralization is a chemical process that happens when an acid is put to a base. Nitric acid, HNO3, reacting with the basic potassium hydroxide, KOH, is one example.
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HNO3 is a strong acid, therefore it completely ionizes to form the ions H+ and NO3-. The acid hue of phenolphthalein is less vibrant and has a pink base tone.
If any of the following best sums up the traits of hno3?An industrial chemical called nitric acid (HNO3) is used to make explosives and fertilizers. It has a boiling point of 83 degrees Celsius and a freezing point of 42 degrees Celsius. It is a translucent, fuming, and exceedingly corrosive liquid. It is noxious and highly burning.
What sort of reaction occurs with HNO3?When such an acid is added to a base, a chemical reaction called neutralization takes place. One example is the reaction of nitric acid (HNO3) and the basic caustic soda (KOH).
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POSSIBLE POINT
Collisions between reactant molecules lead to a reaction when the molecules have the correct orientation and enough kinetic energy
True
False
Answers
Sulfur dioxide is present in our atmosphere, and is used as a preservative and foods. Is it possible to use the common charges that sulfur an oxygen make to determine this formula
Answers
Sulphur dioxide (SO2) is a molecule that consists of one sulphur atom and two oxygen atoms. The sulphur atom has a charge of +6 and the oxygen atoms have a charge of -2, so the overall charge of the molecule is neutral, as the charges cancel out.
The formula for sulphur dioxide is determined by the number of atoms of each element that are present in the molecule. In the case of sulphur dioxide, there is one sulphur atom and two oxygen atoms, so the formula is written as SO2.
The common charges formed by sulphur and oxygen can be used to determine the formula of a compound. The charges of the atoms can be used to determine the number of atoms needed to balance the charges and result in a neutral compound. However, it would not be the only way to determine the formula of a compound; other ways include observing the chemical reactions, using mass spectroscopy, or using X-ray crystallography.
It is possible to use the common charges that sulphur and oxygen atoms make to determine the formula of a compound by determining the number of atoms needed to balance the charges and result in a neutral compound. However, this is not the only way to determine the formula of a compound. Other methods include observing the chemical reactions, using mass spectroscopy, or using X-ray crystallography.
In summary, the formula for sulphur dioxide (SO2) is determined by the number of atoms of each element that are present in the molecule, which in this case is one sulphur atom and two oxygen atoms. The charges of the atoms can be used to determine the number of atoms needed to balance the charges and result in a neutral compound, but it is not the only way to determine the formula of a compound.
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Which ones are elements, compounds I’ll give brainliest.
Answers
TRUE OR FALSE: pH measures the amount of hydrogen or hydronium in water
Answers
Answer:
True
Explanation:
How many grams are in 160 lbs ?
Answers
Gravity is responsible for the
Orbiting path of the panets around the sun.
Rotation of a planet on its rotation axis.
Tilt of Earth's axis.
Pheses of the moon.
Answers
An air bubble with a volume of 5.0 ml is released at the bottom of a lake where the pressure is 3.0 atm. when it reaches the surface, the bubble experiences a pressure of 1.0 atm. formula to use: p1v1 = p2v2 how will the volume of the air bubble change?
Answers
The new volume of the air bubble that has an initial volume of 5.0 ml released at the bottom of a lake where the pressure is 3.0 atm is 15mL.
How to calculate volume?The volume of a given gas can be calculated by using the following formula:
P1V1 = P2V2
Where;
P1 = initial pressureV1 = initial volumeP2 = final pressureV2 = final volume5 × 3 = 1 × V2
15 = V2
V2 = 15mL
Therefore, the new volume of the air bubble that has an initial volume of 5.0 ml released at the bottom of a lake where the pressure is 3.0 atm is 15mL.
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Answer: It will increase
Explanation:
The pressure of Cl2 gas in a 2.0-L cylinder is 300. kPa at 25°C. What is the pressure (in kPa) when this gas is released into a 100-L chamber at 25°C? ______ kPa
Answers
The Final Pressure of the gas is 6 kPa
What is Boyle's Law ?At constant Temperature , the absolute pressure exerted by the gas is inversely proportional to the volume of the gas.
\(\rm P_1V_1 = P_2V_2\)
It is given that
\(\rm P_1 = 300k.Pa\\T_1 = 25 \; Degree\\V_1 = 2L\\V_2 = 100L\\T_2 = 25 Degree\\P_2 = ?\)
To determine Final Pressure , Boyle's Law will be applied
300 * 2 = P₂ * 100
P₂ = 300 * 2 / 100
P₂ =6 kPa
Therefore the Final Pressure of the gas is 6 kPa.
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which term best describes styrofoam?(1 point) responses nonmetal mixture nonmetal mixture metal mixture metal mixture synthetic material synthetic material raw material
Answers
The term that best describes Styrofoam is C. "synthetic material."
Styrofoam is a brand name for a type of expanded polystyrene foam, which is a lightweight, rigid, and insulating material. It is commonly used in packaging, insulation, and disposable food containers. Styrofoam is a synthetic material that is manufactured through a process involving the expansion of polystyrene beads with the use of a blowing agent.
Unlike natural materials such as wood or metal, Styrofoam is not derived from raw materials found in nature. It is a man-made or synthetic material created through chemical processes in a factory setting. The material is composed of polymers, specifically polystyrene, which is a type of synthetic polymer derived from petroleum or natural gas.
Styrofoam is known for its excellent insulation properties, light weight, and buoyancy. However, it is not biodegradable and can have adverse environmental impacts if not properly disposed of or recycled. Due to its synthetic nature, Styrofoam is a nonmetal mixture, as it does not contain any metal elements. Therefore, Option C is correct.
The question was incomplete. find the full content below:
which term best describes styrofoam?(1 point) responses
A) nonmetal mixture
B) metal mixture
C) synthetic material
D) raw material
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newtons 2 law
Q.1)A 3 kg box is accelerating at 9 m/s^2. What is the force acting on the box?
Q.2) A car with a mass of 780 kg has a 235 N force acting on it. What is the acceleration of the car?
Q.3) An object is moving with an acceleration of 5m/s/s due to an acting force of 10N. What is the object’s mass?
Answers
From Newton's second law,
F = ma
Where F is the force
m is the mass
and a is the acceleration
Q.1
Here, we are to determine the force acting on the box
m = 3 kg
a = 9 m/s²
Using the formula,
F = ma
F = 3 × 9
F = 27N
Hence, the force acting on the box is 27N
Q.2
Here, we are to determine the acceleration of the car
m = 780 kg
F = 235 N
Using the same formula,
F = ma
235 = 780 × a
a = 235 / 780
a = 0.30 m/s²
Hence, the acceleration of the car is 0.30 m/s²
Q.3
Here, we are to determine the object's mass
a = 5 m/s²
F = 10 N
Using the same formula,
F = ma
10 = m × 5
m = 10 / 5
m = 2 kg
Hence, the object's mass is 2 kg
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ANSWER THESE 5 MULTPLE CHOICE QUESTIONS!!!
I'LL GIVE 30 POINTS AND A BRAINIEST:)
Answers
Answer:
1. B
2.C
3.D
4.Sorry don't this one :(
5.A
Explanation:
please give me at least 20 points ❤
Which kind of sampling system uses a pump to draw air over a sorbent material?
Active
Passive
Dynamic
Constant-pressure
Answers
The type of sampling system that uses a pump to draw air over a sorbent material is an active sampling system.
Active sampling systems use a pump to draw air over a sorbent material in order to collect a sample. The pump creates a vacuum to draw air from the environment and then passes it over a sorbent material such as activated charcoal or silica gel. The sorbent material collects particles, gases and vapors from the air, which can then be analyzed. This type of system is ideal for measuring short-term, intermittent exposure to pollutants and is often used to monitor workplace air quality.
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Select all that apply.
A chemist is likely to do which of the following?
determine why planets orbit the Sun
analyze the ingredients in ice cream
determine how to separate gasoline from other substances in petroleum
determine the force necessary to push a button through a buttonhole
Answers
Answers: Analyze the ingredients in ice cream and how to separate gasoline from other substances. These answers half to do with chemicals and molecular structure. The other answer choices are not for a chemist. Hope this helps. :)
Explain why the taste of a warm soft drink differs
from the taste of the same soft drink at a cooler
temperature.
Answers
Answer:
Because the physical experience of drinking tells the brain that you're rehydrating.
Explanation:
When the temperature of the drink is hotter or colder than the temperature of your mouth and throat, the temperature-sensing nerves, as well as the touch-sensitive nerves.
How much of a 100.0 gram sample of Gold-98 remains after 8.1 days if
its half-life= 2.7 days?
50.0 g
12.5 g
6.25 g
25.0 g
Answers
Answer:
If half-life is 2.7 days then 8.1 days is three half-lives. 12.5%, or 12.5g, of AU-198 would remain.
Explanation:
Why didn't the liquid methane change phase before the year 2007? Use all the words in the word bank provided to you to complete the response.
Answers
Due to the lack of supply of energy the methane could not change its phase before 2007.
What is the main reason behind this question?Even though it has been summer since 2002, the lake didn't dry up until 2007. After 2007, the sun had given out enough energy for the methane molecules' kinetic energy to rise enough to outweigh their attraction to one another. The methane molecules in the lake were gaining kinetic energy at this moment, but the lake was still liquid. The temperature of the molecules remains constant while they melt because the average kinetic energy of the molecules does not vary.
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is/are examples of secondary pollutants. group of answer choices aerosols volatile organic compounds photochemical oxidants combustion gases dust from soil erosion
Answers
Photochemical oxidants are examples of secondary pollutants.
Photochemical oxidants are secondary pollutants as they are formed in the atmosphere due to the combination of primary pollutants, such as nitrogen oxides and volatile organic compounds, with sunlight. These oxidants can cause smog, respiratory problems, and other environmental issues.
The other options mentioned in the question are: Aerosols, volatile organic compounds, combustion gases, and dust from soil erosion are examples of primary pollutants.Aerosols are solid or liquid particles that are suspended in the air. They can come from natural sources like dust or volcanic ash, or human-made sources like industrial emissions.
Volatile organic compounds (VOCs) are organic chemicals that easily evaporate into the air. They are emitted by many sources such as motor vehicles, industrial processes, and household products.Combustion gases are produced by the burning of fossil fuels or biomass. They can contribute to smog and other environmental problems.Dust from soil erosion is also a primary pollutant, which can cause respiratory problems and contribute to air pollution.
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What are the 7 main properties of matter?
Answers
Answer:Color, Density, Volume, Mass, and Boiling point. These are 5 3 more to go!
Explanation:
Color (intensive), Density (intensive), Volume (extensive), Mass (extensive) , Boiling point (intensive), Melting point (intensive) are the 7 main properties of matter .
What are properties of matter?
Any attribute that can be measured, including an object's density, color, mass, volume, length, malleability, melting point, hardness, odor, temperature, and more, is referred to as a property of matter.
Short answer: What is the matter?
The term "matter" refers to a substance that is composed of several kinds of particles, occupies space, and has inertia. The different kinds of particles each have a unique mass and size, according to the fundamentals of current physics.
The electron, proton, and neutron are three of the most prevalent instances of material particles.
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