Consider the titration of a 32.0 mL sample of 0.180 M HBr with 0.210 M KOH. Determine each of the following:
the initial ph
the volume of added base required to reach the equivalence point
the pH at 10.3 mL of added base
the pH at the equivalence point
the pH after adding 5.0 mL of base beyond the equivalence point
Answers
According to the given information, we can determine the values of initial pH, the volume of added base required to reach the equivalence point, pH at 10.3 mL of added base, pH at the equivalence point, and pH after adding 5.0 mL of base beyond the equivalence point.
Let's first write a balanced chemical equation for the reaction:HBr + KOH → KBr + H2OThe stoichiometry of the reaction is:1 mole of HBr reacts with 1 mole of KOHInitial number of moles of HBr = molarity × volume= 0.180 mol/L × 0.0320 L= 0.00576 molThe balanced equation shows that the number of moles of KOH required to react with HBr completely is the same as that of HBr.
This is the equivalence point.Initial pH:The initial pH can be determined using the expression:pH = -log[H+]Initial concentration of HBr = 0.180 M[H+] = 0.180 MpH = -log(0.180) = 0.744The initial pH is 0.744.Volume of added base required to reach the equivalence point:The volume of KOH required to reach the equivalence point is determined as follows:Number of moles of KOH required to react completely with HBr = 0.00576 molConcentration of KOH = 0.210 MVolume of KOH required = number of moles / concentration= 0.00576 mol / 0.210 mol/L= 0.0274 L = 27.4 mLpH at 10.3 mL of added base:For pH calculations, we need to determine which component is in excess.10.3 mL of KOH × 0.210 mol/L KOH = 0.00216 mol KOHThis amount is less than the moles of HBr in the sample (0.00576 mol). Therefore, the excess component is HBr.
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Related Questions
What does the principle quantum number tell you?
What is the symbol we use for it?
What are shells?
Compare the energy in the 4th shell to that of the 3rd shell.
Answers
1) The energy level of the electron
2) The symbol is n
3) The shells correspond to the energy levels
4) The 4th shell has more energy than the 3rd shell
What is the quantum number?We know that the term quantum number has to do with the position of the electron in the atom. According to the Bohr model of the atom, the electrons that are found in the atom are said to have a specific energy and the electron can move from a lower to a higher energy level by the absorption of energy.
Given the fact that the principal quantum number can also be designated as energy levels or shells, we know that all the electrons that can be found in the atom are said to be classified into certain specific principal quantum levels.
Thus, when we have electrons in an atom, the most basic quantum number is the principal quantum number.
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2. A 250.0 g gold statue at 21.0°C is placed in a tank containing 1105. g of water at an initial temperature
of 80°C. If no heat enters or leaves the system, find the final equilibrium temperature.
Answers
Answer:
The final equilibrium temperature of the system is 37.9°C.
Explanation:
To find the final equilibrium temperature, we need to use the principle of heat conservation, which states that the total heat lost by the hot water is equal to the total heat gained by the cold gold statue. We can express this principle mathematically as follows:
Q_lost = Q_gained
where Q_lost is the heat lost by the water, and Q_gained is the heat gained by the gold statue.
To calculate the heat lost by the water, we can use the formula:
Q_lost = m_w * c_w * (T_i - T_f)
where m_w is the mass of the water, c_w is the specific heat capacity of water, T_i is the initial temperature of the water, and T_f is the final equilibrium temperature.
To calculate the heat gained by the gold statue, we can use the formula:
Q_gained = m_g * c_g * (T_f - T_i)
where m_g is the mass of the gold statue, c_g is the specific heat capacity of gold, T_i is the initial temperature of the gold statue, and T_f is the final equilibrium temperature.
Equating Q_lost and Q_gained, we have:
m_w * c_w * (T_i - T_f) = m_g * c_g * (T_f - T_i)
Substituting the given values, we get:
1105. g * 4.184 J/g°C * (80°C - T_f) = 250.0 g * 0.129 J/g°C * (T_f - 21.0°C)
Simplifying and solving for T_f, we get:
T_f = 37.9°C
Therefore, the final equilibrium temperature is 37.9°C.
Claim-evidence-reasoning: populations of organisms that reproduce asexually tend to show less variation from one individual to another. why might this be? make a claim and use your scientific reasoning skills to support your claim. cer claim: evidence: reasoning
Answers
Asexual reproduction prevents genetic variation within a species since it ensures that all offspring have an identical copy of the parent's DNA unless a mutation arises in the duplicate DNA that is produced.
Why is there no diversity in reproduction from a single parent?Sexual and asexual reproduction are the two options. In sexual reproduction, there are two parents. However, only one parent is engaged in asexual reproduction. In this, offspring of a single parent are genetically identical to the parent. Offspring are physically and genetically similar to their parents. They are a clone or exact replica of the parent. Asexual reproduction doesn't involve any genetic material being recombined.
Thus, the person created by asexual reproduction does not exhibit variety or genetic variability.
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Can someone help me create energy diagrams for these three reactions?
Answers
The energy diagrams of the synthesis, single replacement, and double replacement reactions are found in the attached image.
What are energy profile diagrams?Energy profile diagrams are diagrams which illustrate the potential energy changes that occur when reactant molecule combine to form products.
The energy diagrams shows the potential energy of the reaction, the energy of the transition state of the reaction, the activation energy of the reaction, as well as the potential energy of the products.
From energy diagrams, the enthalpy change of a reaction can be determined. Also, it can also be established whether the reaction is exothermic or endothermic.
For exothermic reactions, the enthalpy change is negative since the potential energy of the reactants is greater than the potential energy of the products.
For endothermic reactions, the enthalpy change is positive since the potential energy of the reactants is less than the potential energy of the products.
Based on this therefore, the energy diagrams of the given reactions have been constructed and are found in the attached image.
In conclusion, energy diagrams are used to show energy changes occurring in a reaction.
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How many protons does an atom of zinc contain?
It contains an amount
Answers
a single neutral atom of zinc has 30 protons
Forget Hydrogen, you’re my number one element ;)
Answers
Answer:
thanks
Explanation:
u a real one 4 tht
How many grams of oxygen does it take to produce 9.60 moles of carbon dioxide?
Answers
307.2grams of oxygen does it take to produce 9.60 moles of carbon dioxide.
Answer:
Solution given:
1 mole of Oxygen=16g
Explanation:
C +O2=CO2
1 mole+ 1 mole =1 mole
12g. + 32g = 44g
we have
1 mole of carbon dioxide=12g of C and 32 g of O2
9.6 mole of carbon dioxide=12*9.6g of C and 32 *9.6g of O2
grams of oxygen needed is 32*9.6=307.2g
etchant removes the _____ layer in preparation for bonding.
Answers
Etchant removes the oxide layer in preparation for bonding.
The surface of most metals, including those commonly used in dentistry such as titanium and cobalt-chrome, naturally develops a thin layer of oxide over time when exposed to air and moisture. This oxide layer can hinder the bonding process by creating a barrier between the metal surface and the bonding material. Etching involves applying an acidic solution to the metal surface to remove this oxide layer, exposing a clean and reactive surface for bonding.
The process of bonding metal to other materials such as ceramics or composites requires the establishment of a strong bond at the interface between the two materials. One of the critical factors that determine the strength of this bond is the surface preparation of the metal substrate. As mentioned earlier, the natural oxide layer that forms on the surface of most metals can impede the bonding process. Therefore, it is necessary to remove this layer before bonding.
Etching is a chemical surface treatment method that involves the application of an acidic solution to the metal surface. The acidic solution selectively dissolves the oxide layer, leaving a clean and reactive surface for bonding. The type of acid used in etching varies depending on the metal substrate being used. For example, hydrofluoric acid is commonly used for etching ceramics, while phosphoric acid is preferred for etching metals.
The etching process is usually followed by the application of a primer or adhesive to the treated metal surface. The adhesive is designed to penetrate into the micro-roughened surface created by the etching process, providing mechanical retention and chemical bonding. The quality of the bond achieved depends on various factors, such as the type of metal, the type of adhesive used, and the etching protocol.
In conclusion, etching is a crucial step in the bonding process as it removes the oxide layer from the metal surface, creating a clean and reactive surface for bonding. Proper surface preparation is essential for achieving a durable and reliable bond between the metal and other materials used in dental restorations.
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Perform the followingmathematical operation, andreport the answer to the correctnumber of significant figures.0.008 : 51.3[? ]x100
Answers
Firsly, we can write the numbers in scientific form:
\(\begin{gathered} 0.008=8\times10^{-3} \\ 51.3=5.13\times10^1 \end{gathered}\)Notice that 0.008 has no tailing zeros, so the only significant figure is "8". 51,6 has 3 significant numbers.
In a division, the result will have the same number of significant figures as the one with less significant figure.
Since the one with less is 0.008, that has only one, the result also only has one significant figure:
\(\frac{0.008}{51.3}=\frac{8\times10^{-3}}{5.13\times10^1}=\frac{8}{5.13}\times10^{-4}=1.559\ldots\times10^{-4}\approx2\times10^{-4}\)pls help bc this is due at 3:30pm
Answers
Answer:
No picture :(
Explanation:
classify nacl as a neutral, acidic, or basic salt.
Answers
NaCl is an example of a neutral salt.
Why is NaCl a neutral salt?
Sodium chloride (NaCl) is a neutral salt because it is composed of both a cation (Na+) and an anion (Cl-) that have equal and opposite charges. The positive charge of the sodium ion (Na+) is exactly balanced by the negative charge of the chloride ion (Cl-), resulting in a neutral compound.
When NaCl dissolves in water, the water molecules surround the ions and separate them from each other. The positively charged sodium ions (Na+) are attracted to the negatively charged oxygen atoms in water molecules, and the negatively charged chloride ions (Cl-) are attracted to the positively charged hydrogen atoms in water molecules. This process is called hydration or solvation.
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Define matter and provide some examples of different states of matter
Answers
The three states of matter are solid - example is stone, liquid - example is water and gas - example is air.
What is matter?A matter is referred to as a substance which has a certain mass and takes up a certain volume in space.
For example pen, pencil, toothbrush, water, milk are matters as well as car, bus, bicycle is also a matter. So matter is considered as a living thing and a non-living thing.
There are three states of matter and they include;
solid - example is stoneliquid - example is watergas - example is airThey have different properties, which can be explained by looking at the arrangement of their particles. This is the theoretical temperature at which particles have the least amount of energy and the slowest movement.
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Mass is measured against a standard using a
Answers
Answer:
balance
Explanation:
What is the number of carbon atoms in a cycloalkyne with 8 hydrogen atoms
Answers
Answer:
4
Explanation:
C4H8
If 20 moles of fuel are combusted in C4H8 + 6 O2 -> 4 CO2 + 4 H2O, how many moles of O2 are consumed?
Answers
If moles of fuel (butene) are combusted in air, the number of moles of oxygen gas produced is 120 moles.
How to calculate moles using stoichiometry?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, 1 mole of butene reacts with 6 moles of oxygen gas to produce 4 moles of carbondioxide and 4 moles of water.
Based on the reaction, 1 mole of fuel reacts with 6 moles of oxygen gas.
This means that 20 moles of fuel will react with 120 moles of oxygen gas.
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can there be 4 electrons in the first energy level
Answers
the reaction of 3.8 mol of al with 6.2 mol hbr will produce ________ mol of h2.
Answers
The reaction of 3.8 mol of Al with 6.2 mol HBr will produce 3 mol of H₂.
The reaction's chemically balanced equation,
3H₂ + 2AlBr₃ → 2Al + 6HBr
As per the equation, 2 moles of hydrogen gas makes 2 moles of Al and correspondingly 6 moles of HBr.
Therefore, if 6.2 moles of hydrogen bromide and 3.8 moles of aluminium react.
3 mol HBr per 1 mol Al
Therefore, 3.8 mol Al (3 mol HBr/1 mol Al) = 11.4 mol HBr is needed for a complete reaction.
Since we only have 6.2 mol of HBr, HBr is limited and Al is abundant.
3 mol H2 / 6 mol HBr = 3 mol H₂ from 6 mol HBr
As a result, 3 mol of H₂ will be produced when 3.8 mol of Al and 6.2 mol of HBr react.
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Pls this is very important for me. Whoever answer this whole I'll mark them as brainliest..... The question is many cars have catalytic converters in their exhaust systems. In a catalytic converter most of the Co and No are formed in a car engine is changed into less harmful products. Identify these products and state the metal catalyst used.
Answers
The most commonly used metal catalyst in catalytic converters is platinum (Pt) among the other possible metals that could also be used in this regard.
What is a catalytic inverter?
Through a sequence of chemical reactions, carbon monoxide (CO) and nitrogen oxides (NOx) produced by an automobile engine are transformed into less hazardous compounds in a catalytic converter.
We know that the catalytic inverter can be able to convert carbon monoxide into carbon dioxide and can also be able to convert nitrogen monoxide to nitrogen dioxide.
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2. Two glasses full of water are left out on a table over
night. Both glasses have a diameter of 10
centimeters, but one is twice as tall as the other.
Which glass do you expect to lose more liquid to
evaporation in a short amount of time?
A.The taller glass
B.The shorter glass
C.They both lose the same amount
D.No evaporation takes place
Answers
Answer: C
Explanation: The evaporation rate depends on the exposed surface of liquid as long as both glasses stay at the same temperature. Since both glasses have the same surface area, they should both evaporate at the same rate.
Which of the following has the least elastic potential energy?
A: a fully stretched rubber band
B: a rubber band sitting on a table
C: a rubber band pulling hair back
Answers
Answer:
B
Explanation:
B.
The rubber band is not being stretched which does not create any potential energy storage.
what is the chemical name for Li2CO2
Answers
Answer:
Lithium Carbonite
Explanation:
Answer:
Lithium
Explanation:
ta 3. Calculate the volume of 18m sulphanc acid that will be required to make 2.7 cm³ 2.7 cm² of 0.1M sulphuric acid
Answers
The volume of 18M sulphuric acid that will be required to make 2.7 cm³ of 0.1M sulphuric acid is 486 cm³.
In order to calculate the volume of 18M sulphuric acid that will be required to make 2.7 cm³ 0.1M sulphuric acid, we need to use the formula:
\(C_{1}V_{1}\) = \(C_{2}V_{2}\),
where \(C_{1}\) is the initial concentration,
\(V_{1 }\) is the initial volume,
\(C{_2}\) is the final concentration, and \(V{_2}\) is the final volume.
Given that the initial volume of 0.1M sulphuric acid is 2.7 cm³, and its concentration is 0.1M.
Therefore, using the formula, we have:
\(C_{1}V_{1}\) = \(C{_2}V{_2}V_{1}\) = \(V{_2}(C{_2}/C{_1})V{_1 }\)= 2.7 cm³ \(C{_2}\) = 0.1M \(C_{1}\) = 18M
Therefore, \(V{_2} = V{_1}(C{_1}/C{_2})\) = 2.7 cm³(18M/0.1M) = 486 cm³.
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an irregularly-shaped piece of aluminum (al) has a mass of 88.3 grams. what is the volume in cm³ of this piece of aluminum if its density is 2.70 g/cm³?
Answers
Therefore, the volume of the irregularly-shaped piece of aluminum is 32.7 cm³
To find the volume of the irregularly-shaped piece of aluminum, we can use the formula:
Density = Mass / Volume
Rearranging the formula to solve for volume, we get:
Volume = Mass / Density
Plugging in the given values:
Volume = 88.3 g / 2.70 g/cm³
Simplifying the equation:
Volume = 32.7 cm³
Therefore, the volume of the irregularly-shaped piece of aluminum is 32.7 cm³.
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What is the momentum of a 0.01 kg toy car moving at 5.0 m/s?
Answers
Answer: 0.05 kgm/s
Explanation:
How many grams of solid magnesium chloride, mgcl2, are needed to make 250 ml of 0. 50 m solution?.
Answers
119 grams of solid magnesium chloride are required to make 250ml of 0.50M solution.
First, we know that a 1 M solution contains
moles of solute per 1.0 L of solution.
This means that a 5.0 M magnesium chloride solution contains 5.0 moles of magnesium chloride (solute) per 1.0 L of solution.
Now all we need to calculate is that the moles of magnesium chloride in solution of 250ml . Hence, the moles of magnesium chloride in 250 ml = 0.250 L of solution is equivalent to 0.50 mol in 1.0 L of solution i.e.,
mol of MgCl₂ / 0.25L = 0.50mol/ 1.0 L
using cross multiplication we get,
moles of MgCl₂ in 250ml solution is 1.24
Now, we can use the number of moles formula to find out the mass of magnesium chloride in solution.
To convert this to grams, number of moles of magnesium chloride = ratio of mass of magnesium chloride to the molar mass of magnesium chloride.
molar mass of magnesium chloride= 95.2 g then mass of magnesium chloride in 250ml solution
= 1.25 × 95.2 = 119g
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Which of the following is the correct Lewis dot structure for F2?
Answers
Answer:b
Explanation:
Correct dot
PLEASE HELP ILL CHOOSE BRAINLIEST I REALLY NEED THE HELP. Tungsten hexaflouride is a very heavy gas (MM=297.8/mol) Find the molar mass the diatomic gas that effuses through a proud plug about 2.8 times faster than the WF6 at the same temperature and pressure?
What is the identity of this diamotic gas?
Answers
Answer:
Tungsten(VI) fluoride, also known as tungsten hexafluoride, is an inorganic compound with the formula WF6. It is a toxic, corrosive, colorless gas, with a density of about 13 g/L (roughly 11 times heavier than air.[
Explanation:
The WF6 molecule is octahedral with the symmetry point group of Oh. The W–F bond distances are 183.2 pm. Between 2.3 and 17 °C, tungsten hexafluoride condenses into a pale yellow liquid having a density of 3.44 g/cm^3 at 15 °C. At 2.3 °C it freezes into a white solid having a cubic crystalline structure, the lattice constant of 628 pm, and a calculated density of 3.99 g/cm^3. At −9 °C this structure transforms into an orthorhombic solid with the lattice constants of a = 960.3 pm, b = 871.3 pm, and c = 504.4 pm, and the density of 4.56 g/cm3. In this phase, the W–F distance is 181 pm, and the mean closest intermolecular contacts are 312 pm. Whereas WF6 gas is one of the densest gases, with the density exceeding that of the heaviest elemental gas radon (9.73 g/L), the density of WF6 in the liquid and solid-state is rather moderate. The vapor pressure of WF6 between −70 and 17 °C can be described by the equation
log10 P = 4.55569 −
1021.208
T + 208.45,
where the P = vapor pressure (bar), T = temperature (°C).
Which molecule in the net reaction of the citrate cycle contributes to the inhibition of pyruvate dehydrogenase?a. NADH.
b. H+.
c. H2O.
d. FAD.
Answers
NADH is the substance that aids in the citric acid cycle's inhibition of pyruvate dehydrogenase.
An enzyme called pyruvate dehydrogenase catalyzes the transformation of pyruvate into acetyl-CoA, which serves as the starting point for the citric acid cycle. The accumulation of NADH, a byproduct of the citric acid cycle, can inform the cell that its energy requirements have been satisfied.
By attaching to a particular regulatory site on pyruvate dehydrogenase, NADH functions as an allosteric inhibitor of the enzyme, reducing its activity and slowing the rate of the citric acid cycle. This aids in controlling the cell's production of acetyl-CoA and preventing the overproduction of ATP.
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anton wants to make 5lb of sugar syrup. how much water and how much sugar does he need to make a 50% concentration of syrup
Answers
To make 5lb of sugar syrup with a 50% concentration, Anton needs to use equal parts of sugar and water by weight. Hence, he needs 2.5lb of sugar and 2.5lb of water.
The concentration of a solute in a given amount of solvent or solution is referred to as its concentration. It is a measure of the amount of one substance (the solute) dissolved in another substance (the solvent).
In a 50% sugar syrup, the concentration of sugar is half the concentration of the total solution. Therefore, we need to use equal parts of sugar and water to achieve a 50% concentration.
To calculate the amount of sugar and water needed, we know that the total weight of the solution is 5lb. Since we need to use equal parts of sugar and water by weight, we divide the total weight by 2 to get the weight of each ingredient:
Sugar weight = 2.5lb
Water weight = 2.5lb
Therefore, Anton needs 2.5lb of sugar and 2.5lb of water to make 5lb of sugar syrup with a 50% concentration.
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true/false. color tests are more specific that microcrystalline tests in identifying a particular drug.
Answers
The given statement -"Microcrystalline tests are more specific than color tests in identifying a particular drug."is false.
Color tests can indicate the presence of a drug, but cannot provide specific information about the type or quantity of the drug. Microcrystalline tests involve the formation of specific crystals in the presence of a particular drug, allowing for more specific identification.
Color testing is a presumptive identification technique indicating the presence or absence of a particular drug class using rapid and uncomplicated chemical methods.
Color tests for drugs are commonly used in forensic and drug analysis to provide preliminary identification of substances. These tests involve adding specific reagents or chemical solutions to a sample, which can produce a color change or reaction indicative of the presence of certain drugs.
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