Question 1

The most suitable acid-base indicator for a titration of acetic acid with NaOH has ________

Accepted Answer

A)   a pKin = pKa of the acid.
B)   a pKin = pKb of the base.
C)   pKin = pH of a sodium acetate solution.
D)   pKin = pH of an acetic acid solution.
E)   pKin = 7.0.F) C) and E)
G) A) and E)

Question 2

A cup of coffee has a hydroxide ion concentration of 1.0 *10-10 M. What is the pH of this coffee?

Accepted Answer

A)   1.0 *10-4
B)   4
C)   10
D)   7
E)   -10F) All of the above
G) None of the above

Question 3

You have a summer job as an intern in an analytical chemistry laboratory. You are about to titrate a solution of nicotine (pKb = 6.0) , which is a base similar to ammonia, with a standard hydrochloric acid solution. Two pH indicators are available for you to use: thymol blue (pKa = 3.47)  and phenolphthalein (pKb = 9.4) . Which indicator do you select as being the more appropriate one to use?

Accepted Answer

A)   Both indicators would work equally well because at the equivalence point the pH of the solution changes very sharply from strongly basic to strongly acidic.
B)   Phenolphthalein is the better choice because it is one of the most commonly used pH indicators.
C)   Neither of these indicators would work because their pKa values are not close to 7.00, which is the pH of the solution at the equivalence point.
D)   Phenolphthalein is the better choice because the sample pH at the equivalence point will be close to the pKa value of 9.4.
E)   Thymol blue is the better choice because the sample pH at the equivalence point will be close to the pKa value of 3.47.F) C) and D)
G) B) and D)

Question 4

A solution with a pH of 9.50 has a pOH of ________

Accepted Answer

A)   9.50.
B)   0.50.
C)   4.50.
D)   23.5.
E)   19.0.F) B) and D)
G) A) and C)

Question 5

Three acids found in foods are lactic acid (in milk products) , oxalic acid (in rhubarb) , and malic
Acid (in apples) . The pKa values are LA = 3.88, OA = 1.23, and MA = 3.40. Which list has the conjugate bases of these acids in order of decreasing strength?

Accepted Answer

A)   lactate > oxalate > malate
B)   oxalate > malate > lactate
C)   lactate > malate > oxalate
D)   oxalate > lactate > malate
E)   malate > lactate > oxalateF) B) and C)
G) None of the above

Question 6

To simulate the pH of blood, which is 7.4, an undergraduate researcher in a biology lab produced a buffer solution by dissolving sodium dihydrogen phosphate (Ka = 6.2 *10-8)  and disodium hydrogen phosphate (Ka = 3.6 *10-13)  together in an aqueous solution. What mole ratio of Na2HPO4/NaH2PO4 did she need to use?

Accepted Answer

A)   1.2
B)   1.6
C)   0.90
D)   1.0
E)   0.96F) D) and E)
G) None of the above

Question 7

Derive the Henderson-Hasselbalch equation from the acid ionization constant expression.

Accepted Answer

The answer of Derive the Henderson-Hasselbalch equation from the acid...

Question 8

Acid-base indicators need to have very intense colors so that a very low concentration is visible. Could there be a problem in using too much indicator?

Accepted Answer

A)   No, the colors would just be darker.
B)   No, indicators are inert.
C)   Yes, more indicator requires more extreme pH values to change color.
D)   Yes, the indicator could affect the acid-base chemistry being measured.
E)   No, the colors would just be sharper.F) A) and E)
G) C) and D)

Question 9

Which sodium halide salt, if any, would you predict to have a solubility in water that increases as the pH decreases?

Accepted Answer

A)   sodium fluoride
B)   sodium chloride
C)   sodium bromide
D)   sodium iodide
E)   The solubility of sodium halide salts should not depend on the pH.F) A) and E)
G) None of the above

Question 10

Stalactites-the long, icicle-like formations that hang from the ceilings of caves-are formed from recrystallizing minerals such as calcite (calcium carbonate) . The Ksp of calcium carbonate is 4.5*10-9. What is the concentration of a saturated calcium carbonate solution?

Accepted Answer

A)   0.00104 M
B)   4.5 *10-9 M
C)   6.7 *10-5 M
D)   2.25 *10-9 M
E)   4.5 *10-5 MF) B) and D)
G) A) and E)

Question 11

The pKa of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.40 M and its conjugate base at 0.60 M. The measured pH was 7.8. What is the pKa of the
Weak acid?

Accepted Answer

A)   8.0
B)   7.8
C)   7.6
D)   7.0
E)   7.4F) C) and E)
G) A) and B)

Question 12

The concentration of acetic acid in vinegar is about 1.0 M, and the pH is about 2.4. With this information, what do you expect the pKa of vinegar to be?

Accepted Answer

Question 13

In the following reaction in aqueous solution, the acid reactant is ________ and its conjugate base product is ________.
CH3COOH + NH3  ⇆\leftrightarrows⇆ CH3COO- + NH4+

Accepted Answer

A)   CH3COOH; CH3COO-
B)   CH3COOH; NH4+
C)   NH3; CH3COO-
D)   NH3; NH4+
E)   CH3COOH; H3O+ F) A) and B)
G) A) and C)

Question 14

Which one of the following statements is not correct?

Accepted Answer

A)   A strong acid solution has a higher concentration than a weak acid solution.
B)   A strong acid is ionized to a greater extent than a weak acid.
C)   Hydrochloric acid is an example of a strong acid.
D)   Acetic acid is an example of a weak acid.
E)   The pH of a 0.1 M solution of acetic acid is higher than the pH of a 0.1 M solution of hydrochloric acid.F) B) and D)
G) B) and C)

Question 15

Which one of the following is a strong acid?

Accepted Answer

A)   nitrous acid, HNO2
B)   sulfurous acid, H2SO3
C)   carbonic acid, H2CO3
D)   hydrofluoric acid, HF
E)   perchloric acid, HClO4F) A) and C)
G) A) and E)

Question 16

In the Brønsted-Lowry definition of acids and bases, a base ________

Accepted Answer

A)   is a proton donor.
B)   is a proton acceptor.
C)   forms stable hydrogen bonds.
D)   breaks stable hydrogen bonds.
E)   corrodes metals.F) A) and C)
G) A) and E)

Question 17

Which one of the following is not a strong base?

Accepted Answer

A)   lithium hydroxide, LiOH
B)   sodium hydroxide, NaOH
C)   potassium hydroxide, KOH
D)   calcium hydroxide, Ca(OH) 2
E)   ammonium hydroxide, NH4OHF) A) and E)
G) A) and B)

Question 18

The analysis label on a 500 mL bottle of Fiji natural artesian water reports pH = 7.5 and 140 mg of bicarbonates, HCO3-. Calculate the pH expected as a result of the bicarbonates to see if these two numbers are consistent with each other. (Kb = 2.4 * 10-8 for HCO3-)

Accepted Answer

A)   7.5
B)   5.0
C)   9.6
D)   4.4
E)   9.0F) A) and C)
G) A) and D)

Question 19

Give an example of a monoprotic acid and a polyprotic acid.

Accepted Answer

Monoprotic...

Question 20

When pure water autoionizes, the following ions are produced: ________

Accepted Answer

A)   O2-, OH-, H3O+, and H2O+.
B)   OH- and H3O+.
C)   O2- and H4O2+.
D)   H+ and OH-.
E)   2H+ and O2-.F) A) and E)
G) D) and E)

Exam 16: Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Correct Answer
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Which one of the following statements is not correct?

Correct Answer
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A cup of coffee has a hydroxide ion concentration of 1.0 *10^-¹⁰ M. What is the pH of this coffee?

Correct Answer
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When pure water autoionizes, the following ions are produced: ________

Correct Answer
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Derive the Henderson-Hasselbalch equation from the acid ionization constant expression.

Correct Answer
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Which one of the following is a strong acid?

Correct Answer
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Acid-base indicators need to have very intense colors so that a very low concentration is visible. Could there be a problem in using too much indicator?

Correct Answer
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In the following reaction in aqueous solution, the acid reactant is and its conjugate base product is . CH₃COOH + NH₃ $\leftrightarrows$ CH₃COO^- + NH₄⁺

Correct Answer
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Give an example of a monoprotic acid and a polyprotic acid.

Correct Answer
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Monoprotic...
View Answer

The pK_a of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.40 M and its conjugate base at 0.60 M. The measured pH was 7.8. What is the pK_a of the Weak acid?

Correct Answer
verified

Three acids found in foods are lactic acid (in milk products) , oxalic acid (in rhubarb) , and malic Acid (in apples) . The pK_a values are LA = 3.88, OA = 1.23, and MA = 3.40. Which list has the conjugate bases of these acids in order of decreasing strength?

Correct Answer
verified

The concentration of acetic acid in vinegar is about 1.0 M, and the pH is about 2.4. With this information, what do you expect the pK_a of vinegar to be?

Correct Answer
verified

The most suitable acid-base indicator for a titration of acetic acid with NaOH has ________

Correct Answer
verified

Which one of the following is not a strong base?

Correct Answer
verified

The analysis label on a 500 mL bottle of Fiji natural artesian water reports pH = 7.5 and 140 mg of bicarbonates, HCO₃^-. Calculate the pH expected as a result of the bicarbonates to see if these two numbers are consistent with each other. (K_b = 2.4 * 10^-⁸ for HCO₃^-)

Correct Answer
verified

Correct Answer
verified

Stalactites-the long, icicle-like formations that hang from the ceilings of caves-are formed from recrystallizing minerals such as calcite (calcium carbonate) . The K_sp of calcium carbonate is 4.5*10^-⁹. What is the concentration of a saturated calcium carbonate solution?

Correct Answer
verified

In the Brønsted-Lowry definition of acids and bases, a base ________

Correct Answer
verified

A solution with a pH of 9.50 has a pOH of ________

Correct Answer
verified

Which sodium halide salt, if any, would you predict to have a solubility in water that increases as the pH decreases?

Correct Answer
verified

Exam 16: Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Correct AnswerverifiedShow Answer

Which one of the following statements is not correct?

Correct AnswerverifiedShow Answer

A cup of coffee has a hydroxide ion concentration of 1.0 *10-10 M. What is the pH of this coffee?

Correct AnswerverifiedShow Answer

When pure water autoionizes, the following ions are produced: ________

Correct AnswerverifiedShow Answer

Derive the Henderson-Hasselbalch equation from the acid ionization constant expression.

Correct AnswerverifiedShow Answer

Which one of the following is a strong acid?

Correct AnswerverifiedShow Answer

Acid-base indicators need to have very intense colors so that a very low concentration is visible. Could there be a problem in using too much indicator?

Correct AnswerverifiedShow Answer

In the following reaction in aqueous solution, the acid reactant is ________ and its conjugate base product is ________. CH3COOH + NH3 ⇆\leftrightarrows⇆ CH3COO- + NH4+

Correct AnswerverifiedShow Answer

Give an example of a monoprotic acid and a polyprotic acid.

Correct AnswerverifiedMonoprotic...View AnswerShow Answer

The pKa of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.40 M and its conjugate base at 0.60 M. The measured pH was 7.8. What is the pKa of the Weak acid?

Correct AnswerverifiedShow Answer

Three acids found in foods are lactic acid (in milk products) , oxalic acid (in rhubarb) , and malic Acid (in apples) . The pKa values are LA = 3.88, OA = 1.23, and MA = 3.40. Which list has the conjugate bases of these acids in order of decreasing strength?

Correct AnswerverifiedShow Answer

The concentration of acetic acid in vinegar is about 1.0 M, and the pH is about 2.4. With this information, what do you expect the pKa of vinegar to be?

Correct AnswerverifiedShow Answer

The most suitable acid-base indicator for a titration of acetic acid with NaOH has ________

Correct AnswerverifiedShow Answer

Which one of the following is not a strong base?

Correct AnswerverifiedShow Answer

The analysis label on a 500 mL bottle of Fiji natural artesian water reports pH = 7.5 and 140 mg of bicarbonates, HCO3-. Calculate the pH expected as a result of the bicarbonates to see if these two numbers are consistent with each other. (Kb = 2.4 * 10-8 for HCO3-)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Stalactites-the long, icicle-like formations that hang from the ceilings of caves-are formed from recrystallizing minerals such as calcite (calcium carbonate) . The Ksp of calcium carbonate is 4.5*10-9. What is the concentration of a saturated calcium carbonate solution?

Correct AnswerverifiedShow Answer

In the Brønsted-Lowry definition of acids and bases, a base ________

Correct AnswerverifiedShow Answer

A solution with a pH of 9.50 has a pOH of ________

Correct AnswerverifiedShow Answer

Which sodium halide salt, if any, would you predict to have a solubility in water that increases as the pH decreases?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

A cup of coffee has a hydroxide ion concentration of 1.0 *10^-¹⁰ M. What is the pH of this coffee?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the following reaction in aqueous solution, the acid reactant is and its conjugate base product is . CH₃COOH + NH₃ $\leftrightarrows$ CH₃COO^- + NH₄⁺

Correct Answer
verified

Correct Answer
verified
Monoprotic...
View Answer

The pK_a of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.40 M and its conjugate base at 0.60 M. The measured pH was 7.8. What is the pK_a of the Weak acid?

Correct Answer
verified

Three acids found in foods are lactic acid (in milk products) , oxalic acid (in rhubarb) , and malic Acid (in apples) . The pK_a values are LA = 3.88, OA = 1.23, and MA = 3.40. Which list has the conjugate bases of these acids in order of decreasing strength?

Correct Answer
verified

The concentration of acetic acid in vinegar is about 1.0 M, and the pH is about 2.4. With this information, what do you expect the pK_a of vinegar to be?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The analysis label on a 500 mL bottle of Fiji natural artesian water reports pH = 7.5 and 140 mg of bicarbonates, HCO₃^-. Calculate the pH expected as a result of the bicarbonates to see if these two numbers are consistent with each other. (K_b = 2.4 * 10^-⁸ for HCO₃^-)

Correct Answer
verified

Correct Answer
verified

Stalactites-the long, icicle-like formations that hang from the ceilings of caves-are formed from recrystallizing minerals such as calcite (calcium carbonate) . The K_sp of calcium carbonate is 4.5*10^-⁹. What is the concentration of a saturated calcium carbonate solution?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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