Question 1

Hydroxylamine, HONH2, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has Kb of 9.1 * 10¯9. What is the pH of a 0.025 M HONH2 solution?

Accepted Answer

A)   2.90
B)   4.82
C)   9.18
D)   9.91
E)   11.10F) A) and B)
G) All of the above

Question 2

Which of the following acids has the lowest pH?

Accepted Answer

A)   0.1 M HBO, pKa = 2.43
B)   0.1 M HA, pKa = 4.55
C)   0.1 M HMO, pKa = 8.23
D)   0.1 M HST, pKa = 11.89
E)   pure waterF) A) and D)
G) None of the above

Question 3

If the compound HX is a strong acid (where H is the acidic proton in this acid), then the ion X¯ is a weak base.

Accepted Answer

A) True 
 B)False

Question 4

What is the [OH¯] for a solution at 25  °\degree° C that has [H3O+] = 8.23 *10¯2 M?

Accepted Answer

A)   > 10¯5 M
B)   1.22 * 10¯6 M
C)   8.23 *10¯12 M
D)   1.22 * 10¯13 M
E)   8.23 * 10¯16 M F) All of the above
G) B) and D)

Question 5

Given: w will increase. D)  the hydronium ion concentration could change to 1.0 *10¯10 M. E)  the hydroxide ion concentration could change to 1.0 *10¯10 M. " class="answers-bank-image d-inline" rel="preload" > When the temperature of a sample of pure water is raised above 25  °\degree° C,

Accepted Answer

A)   the hydronium ion concentration will be greater than the hydroxide ion concentration.
B)   the hydronium ion concentration will be less than the hydroxide ion concentration.
C)   the value of Kw will increase.
D)   the hydronium ion concentration could change to 1.0 *10¯10 M.
E)   the hydroxide ion concentration could change to 1.0 *10¯10 M. F) D) and E)
G) B) and E)

Question 6

The English are fond of soggy French fries ("chips") wrapped in old newspaper and generously drenched in vinegar, which is a 0.83 M solution of acetic acid. If the acetic acid in vinegar is 0.47% dissociated, calculate Ka for this acid.

Accepted Answer

K_a = 1.8 *10¯⁵

Question 7

What is the pH of a 0.010 M triethanolammonium chloride, (HOC2H2) 3NHCl, solution? 
Kb, ((HOC2H2) 3N)  = 5.9 *10¯7

Accepted Answer

A)   2.75
B)   4.89
C)   9.11
D)   11.25
E)   None of these choices is correct.F) A) and D)
G) A) and C) B

Question 8

If a strong acid such as HCl is diluted sufficiently with water, the pH will be higher than 7.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following aqueous systems has the highest pH?

Accepted Answer

A)   0.1 M HA, pKa = 11.89
B)   0.1 M HMO, pKa = 8.23
C)   0.1 M HA, pKa = 4.55
D)   0.1 M HBO, pKa = 2.43
E)   pure waterF) A) and C)
G) C) and D)

Question 10

What is the [OH¯] for a solution at 25  °\degree° C that has [H3O+] = 2.35 * 10¯3 M?

Accepted Answer

A)   4.26 * 10¯5 M
B)   2.35 *10¯11 M
C)   4.26 * 10¯12 M
D)   2.35 *10¯17 M
E)   None of these choices is correct. F) C) and D)
G) A) and C)

Question 11

A student adds 0.1 mol of oxalic acid and 0.1 mol of sodium dihydrogen phosphate to enough water to make 1.0 L of solution. The following equilibrium is established with the concentrations of the products greater than the concentrations of the reactants. Which of the statements about the equilibrium system is correct? 2O4¯, is a stronger base than the dihydrogen phosphate anion, H2PO4¯. C)  Phosphoric acid is a weaker acid than oxalic acid. D)  The dihydrogen phosphate anion, H2PO4¯, is a stronger acid than oxalic acid. E)  Water is a stronger acid than either oxalic or phosphoric acids." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Oxalic acid is a weaker acid than phosphoric acid.
B)   The hydrogen oxalate anion, HC2O4¯, is a stronger base than the dihydrogen phosphate anion, H2PO4¯.
C)   Phosphoric acid is a weaker acid than oxalic acid.
D)   The dihydrogen phosphate anion, H2PO4¯, is a stronger acid than oxalic acid.
E)   Water is a stronger acid than either oxalic or phosphoric acids.F) C) and E)
G) A) and E)

Question 12

All Brønsted-Lowry bases contain the hydroxide ion, OH¯.

Accepted Answer

A) True 
 B)False

Question 13

What is the value of Kb for the formate anion, HCOO¯? Ka(HCOOH)  = 2.1 * 10¯4

Accepted Answer

A)   -2.1 * 10¯4
B)   2.1 * 10¯4
C)   6.9 * 10¯6
D)   4.8 * 10¯11
E)   2.1 *10¯18F) A) and B)
G) C) and D)

Question 14

A) Write a balanced equation representing the reaction of the acid, H2PO4¯ with the base, water.
B) Write the expression for Ka of H2PO4¯ in terms of concentrations of relevant species.

Accepted Answer

A)11ec9252_d986_1849_b435_a90f...

Question 15

The substance HClO4 is considered

Accepted Answer

A)   a weak acid.
B)   a weak base.
C)   a strong acid.
D)   a strong base.
E)   a neutral compound.F) D) and E)
G) C) and D) C

Question 16

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H3O+] for a 0.20 M solution of picric acid?

Accepted Answer

A)   0.022 M
B)   0.052 M
C)   0.15 M
D)   0.29 M
E)   None of these choices is correct.F) C) and E)
G) A) and B)

Question 17

The substance (CH3CH2) 2NH is considered

Accepted Answer

A)   a weak acid.
B)   a weak base.
C)   a strong acid.
D)   a strong base.
E)   a neutral compound.F) None of the above
G) A) and C)

Question 18

The hydrated Al3+ ion, Al(H2O) 63+, is a weak acid in water. What are the products of its reaction with H2O? 
Al(H2O) 63+(aq)  + H2O(l)   →\rightarrow→  ?

Accepted Answer

A)   Al(H2O) 5OH2+(aq)  + H3O+(aq) 
B)   Al(H2O) 6H4+(aq)  + OH¯( aq) 
C)   Al(H2O) 53+(aq)  + 2H2O(l) 
D)   Al(H2O) 6OH2+(aq)  + H3O+( aq) 
E)   Al(H2O) 62+(aq)  + H3O+( aq)  F) A) and B)
G) A) and C)

Question 19

A solution is prepared by adding 0.10 mol of iron(III)  nitrate, Fe(NO3) 3, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

A)   The solution is basic.
B)   The solution is neutral.
C)   The solution is acidic.
D)   The value of Ka for the species in solution must be known before a prediction can be made.
E)   The value of Kb for the species in solution must be known before a prediction can be made.F) C) and E)
G) A) and C)

Question 20

Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH4Cl, is correct?

Accepted Answer

A)   The solution is weakly basic.
B)   The solution is strongly basic.
C)   The solution is neutral.
D)   The solution is acidic.
E)   The values for Ka and Kb for the species in solution must be known before a prediction can be made.F) B) and E)
G) B) and D)

Exam 18: Acid-Base Equilibria

Hydroxylamine, HONH₂, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has K_b of 9.1 * 10¯⁹. What is the pH of a 0.025 M HONH₂ solution?

Correct Answer
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Which of the following acids has the lowest pH?

Correct Answer
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If the compound HX is a strong acid (where H is the acidic proton in this acid), then the ion X¯ is a weak base.

Correct Answer
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What is the [OH¯] for a solution at 25 $\degree$ C that has [H₃O⁺] = 8.23 *10¯² M?

Correct Answer
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Correct Answer
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The English are fond of soggy French fries ("chips") wrapped in old newspaper and generously drenched in vinegar, which is a 0.83 M solution of acetic acid. If the acetic acid in vinegar is 0.47% dissociated, calculate K_a for this acid.

Correct Answer
verified
K_a = 1.8 *10¯⁵

What is the pH of a 0.010 M triethanolammonium chloride, (HOC₂H₂) ₃NHCl, solution? K_b, ((HOC₂H₂) ₃N) = 5.9 *10¯⁷

Correct Answer
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B

If a strong acid such as HCl is diluted sufficiently with water, the pH will be higher than 7.

Correct Answer
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Which of the following aqueous systems has the highest pH?

Correct Answer
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What is the [OH¯] for a solution at 25 $\degree$ C that has [H₃O⁺] = 2.35 * 10¯³ M?

Correct Answer
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Correct Answer
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All Brønsted-Lowry bases contain the hydroxide ion, OH¯.

Correct Answer
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What is the value of K_b for the formate anion, HCOO¯? K_a(HCOOH) = 2.1 * 10¯⁴

Correct Answer
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A) Write a balanced equation representing the reaction of the acid, H₂PO₄¯ with the base, water. B) Write the expression for K_a of H₂PO₄¯ in terms of concentrations of relevant species.

Correct Answer
verified
A)11ec9252_d986_1849_b435_a90f...
View Answer

The substance HClO₄ is considered

Correct Answer
verified
C

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H₃O⁺] for a 0.20 M solution of picric acid?

Correct Answer
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The substance (CH₃CH₂) ₂NH is considered

Correct Answer
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The hydrated Al³⁺ ion, Al(H₂O) ₆³⁺, is a weak acid in water. What are the products of its reaction with H₂O? Al(H₂O) ₆³⁺(aq) + H₂O(l) $\rightarrow$ ?

Correct Answer
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A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO₃) ₃, to 1.00 L of water. Which statement about the solution is correct?

Correct Answer
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Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH₄Cl, is correct?

Correct Answer
verified

Exam 18: Acid-Base Equilibria

Hydroxylamine, HONH2, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has Kb of 9.1 * 10¯9. What is the pH of a 0.025 M HONH2 solution?

Correct AnswerverifiedShow Answer

Which of the following acids has the lowest pH?

Correct AnswerverifiedShow Answer

If the compound HX is a strong acid (where H is the acidic proton in this acid), then the ion X¯ is a weak base.

Correct AnswerverifiedShow Answer

What is the [OH¯] for a solution at 25 °\degree° C that has [H3O+] = 8.23 *10¯2 M?

Correct AnswerverifiedShow Answer

Given: When the temperature of a sample of pure water is raised above 25 °\degree° C,

Correct AnswerverifiedShow Answer

The English are fond of soggy French fries ("chips") wrapped in old newspaper and generously drenched in vinegar, which is a 0.83 M solution of acetic acid. If the acetic acid in vinegar is 0.47% dissociated, calculate Ka for this acid.

Correct AnswerverifiedKa = 1.8 *10¯5

What is the pH of a 0.010 M triethanolammonium chloride, (HOC2H2) 3NHCl, solution? Kb, ((HOC2H2) 3N) = 5.9 *10¯7

Correct AnswerverifiedB

If a strong acid such as HCl is diluted sufficiently with water, the pH will be higher than 7.

Correct AnswerverifiedShow Answer

Which of the following aqueous systems has the highest pH?

Correct AnswerverifiedShow Answer

What is the [OH¯] for a solution at 25 °\degree° C that has [H3O+] = 2.35 * 10¯3 M?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

All Brønsted-Lowry bases contain the hydroxide ion, OH¯.

Correct AnswerverifiedShow Answer

What is the value of Kb for the formate anion, HCOO¯? Ka(HCOOH) = 2.1 * 10¯4

Correct AnswerverifiedShow Answer

A) Write a balanced equation representing the reaction of the acid, H2PO4¯ with the base, water. B) Write the expression for Ka of H2PO4¯ in terms of concentrations of relevant species.

Correct AnswerverifiedA)11ec9252_d986_1849_b435_a90f...View AnswerShow Answer

The substance HClO4 is considered

Correct AnswerverifiedC

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H3O+] for a 0.20 M solution of picric acid?

Correct AnswerverifiedShow Answer

The substance (CH3CH2) 2NH is considered

Correct AnswerverifiedShow Answer

The hydrated Al3+ ion, Al(H2O) 63+, is a weak acid in water. What are the products of its reaction with H2O? Al(H2O) 63+(aq) + H2O(l) →\rightarrow→ ?

Correct AnswerverifiedShow Answer

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO3) 3, to 1.00 L of water. Which statement about the solution is correct?

Correct AnswerverifiedShow Answer

Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH4Cl, is correct?

Correct AnswerverifiedShow Answer

Hydroxylamine, HONH₂, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has K_b of 9.1 * 10¯⁹. What is the pH of a 0.025 M HONH₂ solution?

Correct Answer
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Correct Answer
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Correct Answer
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What is the [OH¯] for a solution at 25 $\degree$ C that has [H₃O⁺] = 8.23 *10¯² M?

Correct Answer
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Correct Answer
verified

The English are fond of soggy French fries ("chips") wrapped in old newspaper and generously drenched in vinegar, which is a 0.83 M solution of acetic acid. If the acetic acid in vinegar is 0.47% dissociated, calculate K_a for this acid.

Correct Answer
verified
K_a = 1.8 *10¯⁵

What is the pH of a 0.010 M triethanolammonium chloride, (HOC₂H₂) ₃NHCl, solution? K_b, ((HOC₂H₂) ₃N) = 5.9 *10¯⁷

Correct Answer
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B

Correct Answer
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Correct Answer
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What is the [OH¯] for a solution at 25 $\degree$ C that has [H₃O⁺] = 2.35 * 10¯³ M?

Correct Answer
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Correct Answer
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Correct Answer
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What is the value of K_b for the formate anion, HCOO¯? K_a(HCOOH) = 2.1 * 10¯⁴

Correct Answer
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A) Write a balanced equation representing the reaction of the acid, H₂PO₄¯ with the base, water. B) Write the expression for K_a of H₂PO₄¯ in terms of concentrations of relevant species.

Correct Answer
verified
A)11ec9252_d986_1849_b435_a90f...
View Answer

The substance HClO₄ is considered

Correct Answer
verified
C

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H₃O⁺] for a 0.20 M solution of picric acid?

Correct Answer
verified

The substance (CH₃CH₂) ₂NH is considered

Correct Answer
verified

The hydrated Al³⁺ ion, Al(H₂O) ₆³⁺, is a weak acid in water. What are the products of its reaction with H₂O? Al(H₂O) ₆³⁺(aq) + H₂O(l) $\rightarrow$ ?

Correct Answer
verified

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO₃) ₃, to 1.00 L of water. Which statement about the solution is correct?

Correct Answer
verified

Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH₄Cl, is correct?

Correct Answer
verified