Question 1

Which one of the following substances will give an aqueous solution of pH < 7?

Accepted Answer

A)  KI
B)  NH4Br
C)  Na2CO3
D)  CH3COONa
E)  CH3OH

Question 2

Formic acid,which is a component of insect venom,has a Ka = 1.8  ×	imes×  10-4.What is the [H3O+] in a solution that is initially 0.10 M formic acid,HCOOH?

Accepted Answer

A)  4.2  ×	imes×  10-3 M
B)  8.4  ×	imes×  10-3 M
C)  1.8  ×	imes×  10-4 M
D)  1.8  ×	imes×  10-5 M
E)  1.8  ×	imes×  10-6 M

Question 3

What is the value of Kb for the cyanide anion,CN-?
Ka(HCN) = 6.2  ×	imes×  10-10

Accepted Answer

A)  1.6  ×	imes×  10-4
B)  1.6  ×	imes×  10-5
C)  3.8  ×	imes×  10-4
D)  3.8  ×	imes×  10-5
E)  6.2  ×	imes×  104

Question 4

What is the pH of a 0.050 M HBr solution?

Accepted Answer

A)  0.89
B)  1.12
C)  1.30
D)  3.00
E)  None of these choices is correct.

Question 5

Which of the following pairs has the stronger acid listed first?

Accepted Answer

A)  HBr,HI
B)  HClO2,HClO3
C)  H2SeO4,H2SeO3
D)  HNO2,HNO3
E)  HF,HCl

Question 6

According to Brønsted and Lowry,which one of the following is not a conjugate acid-base pair?

Accepted Answer

A)  H3O+/OH-
B)  CH3OH2+/CH3OH
C)  HI/I-
D)  HSO4-/SO42-
E)  H2/H-

Question 7

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

Accepted Answer

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

Question 8

A solution of sodium acetate (CH3COONa)in water is weakly basic.

Accepted Answer

A) True 
 B)False

Question 9

What is the [H3O+] for a solution at 25°C that has pOH = 5.640?

Accepted Answer

A)  2.34  ×	imes×  10-4 M
B)  2.29  ×	imes×  10-6 M
C)  4.37  ×	imes×  10-9 M
D)  4.27  ×	imes×  10-11 M
E)  8.360 M

Question 10

A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of Ka for this acid?

Accepted Answer

A)  7.2  ×	imes×  101
B)  0.16
C)  0.099
D)  0.0014
E)  0.00027

Question 11

A 0.050 M solution of the weak acid HA has [H3O+] = 3.77  ×	imes×  10-4 M.What is the Ka for the acid?

Accepted Answer

A)  7.5  ×	imes×  10-3 M
B)  2.8  ×	imes×  10-6 M
C)  7.0  ×	imes×  10-7 M
D)  7.0  ×	imes×  10-8 M
E)  2.6  ×	imes×  10-11 M

Question 12

What is the pH of a 0.0100 M sodium benzoate solution?
Kb (C7H5O2-) = 1.5  ×	imes×  10-10

Accepted Answer

A)  0.38
B)  5.91
C)  8.09
D)  9.82
E)  13.62

Question 13

A solution is prepared by adding 0.10 mol of sodium sulfide,Na2S,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 concentration of sodium ions and sulfide ions will be identical.
E)  The concentration of sulfide ions will be greater than the concentration of sodium ions.

Question 14

Arsenic acid,H3AsO4,is used industrially to manufacture insecticides.Arsenic acid is a polyprotic acid with K1 = 2.5  ×	imes×  10-4,K2 = 5.6  ×	imes×  10-8,and K3 = 3  ×	imes×  10-13.What is the concentration of the HAsO42- in a solution whose initial arsenic acid concentration was 0.35 M?

Accepted Answer

A)  9.4  ×	imes×  10-3 M
B)  2.5  ×	imes×  10-4 M
C)  8.8  ×	imes×  10-5 M
D)  5.6  ×	imes×  10-8 M
E)  None of these choices is correct.

Question 15

Farmers who raise cotton once used arsenic acid,H3AsO4,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with K1 = 2.5  ×	imes×  10-4,K2 = 5.6  ×	imes×  10-8,and K3 = 3  ×	imes×  10-13.What is the pH of a 0.500 M solution of arsenic acid?

Accepted Answer

A)  0.85
B)  1.96
C)  3.90
D)  4.51
E)  None of these choices is correct.

Question 16

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?
H2C2O4(aq) + H2PO4-(aq)  2C2O4(aq) + H2PO4-(aq)    HC2O4-(aq) + H3PO4(aq)  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." class="answers-bank-image d-inline" rel="preload" >
HC2O4-(aq) + H3PO4(aq)

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.

Question 17

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 18

All weak acids have strong conjugate bases.

Accepted Answer

A) True 
 B)False

Question 19

What is the pH of a 0.20 M HCl solution?

Accepted Answer

A)  
B)  0.70
C)  1.61
D)  12.39
E)  13.30

Question 20

The substance H2SO3 is considered

Accepted Answer

A)  a weak Arrhenius base.
B)  a strong Arrhenius acid.
C)  a strong Arrhenius base.
D)  a neutral compound.
E)  a weak Arrhenius acid.

Exam 18: Acid-Base Equilibria

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

Correct Answer
verified

What is the pH of a 0.050 M HBr solution?

Correct Answer
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A solution of sodium acetate (CH₃COONa)in water is weakly basic.

Correct Answer
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A solution is prepared by adding 0.10 mol of sodium sulfide,Na₂S,to 1.00 L of water.Which statement about the solution is correct?

Correct Answer
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What is the [H₃O⁺] for a solution at 25°C that has pOH = 5.640?

Correct Answer
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Correct Answer
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Which one of the following substances will give an aqueous solution of pH < 7?

Correct Answer
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What is the value of K_b for the cyanide anion,CN^-? K_a(HCN) = 6.2 $\times$ 10^-10

Correct Answer
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A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of K_a for this acid?

Correct Answer
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According to Brønsted and Lowry,which one of the following is not a conjugate acid-base pair?

Correct Answer
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All weak acids have strong conjugate bases.

Correct Answer
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Which of the following pairs has the stronger acid listed first?

Correct Answer
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What is the pH of a 0.0100 M sodium benzoate solution? K_b (C₇H₅O₂^-) = 1.5 $\times$ 10^-10

Correct Answer
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Farmers who raise cotton once used arsenic acid,H₃AsO₄,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with K₁ = 2.5 $\times$ 10^-4,K₂ = 5.6 $\times$ 10^-8,and K₃ = 3 $\times$ 10^-13.What is the pH of a 0.500 M solution of arsenic acid?

Correct Answer
verified

Formic acid,which is a component of insect venom,has a K_a = 1.8 $\times$ 10^-4.What is the [H₃O⁺] in a solution that is initially 0.10 M formic acid,HCOOH?

Correct Answer
verified

What is the pH of a 0.010 M triethanolammonium chloride, (HOC₂H₂) ₃NHCl,solution? K_b, ((HOC₂H₂) ₃N) = 5.9 $\times$ 10^-7

Correct Answer
verified

What is the pH of a 0.20 M HCl solution?

Correct Answer
verified

A 0.050 M solution of the weak acid HA has [H₃O⁺] = 3.77 $\times$ 10^-4 M.What is the K_a for the acid?

Correct Answer
verified

Correct Answer
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The substance H₂SO₃ is considered

Correct Answer
verified

Exam 18: Acid-Base Equilibria

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

Correct AnswerverifiedShow Answer

What is the pH of a 0.050 M HBr solution?

Correct AnswerverifiedShow Answer

A solution of sodium acetate (CH3COONa)in water is weakly basic.

Correct AnswerverifiedShow Answer

A solution is prepared by adding 0.10 mol of sodium sulfide,Na2S,to 1.00 L of water.Which statement about the solution is correct?

Correct AnswerverifiedShow Answer

What is the [H3O+] for a solution at 25°C that has pOH = 5.640?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which one of the following substances will give an aqueous solution of pH < 7?

Correct AnswerverifiedShow Answer

What is the value of Kb for the cyanide anion,CN-? Ka(HCN) = 6.2 ×\times× 10-10

Correct AnswerverifiedShow Answer

A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of Ka for this acid?

Correct AnswerverifiedShow Answer

According to Brønsted and Lowry,which one of the following is not a conjugate acid-base pair?

Correct AnswerverifiedShow Answer

All weak acids have strong conjugate bases.

Correct AnswerverifiedShow Answer

Which of the following pairs has the stronger acid listed first?

Correct AnswerverifiedShow Answer

What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-) = 1.5 ×\times× 10-10

Correct AnswerverifiedShow Answer

Farmers who raise cotton once used arsenic acid,H3AsO4,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with K1 = 2.5 ×\times× 10-4,K2 = 5.6 ×\times× 10-8,and K3 = 3 ×\times× 10-13.What is the pH of a 0.500 M solution of arsenic acid?

Correct AnswerverifiedShow Answer

Formic acid,which is a component of insect venom,has a Ka = 1.8 ×\times× 10-4.What is the [H3O+] in a solution that is initially 0.10 M formic acid,HCOOH?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the pH of a 0.20 M HCl solution?

Correct AnswerverifiedShow Answer

A 0.050 M solution of the weak acid HA has [H3O+] = 3.77 ×\times× 10-4 M.What is the Ka for the acid?

Correct AnswerverifiedShow Answer

Arsenic acid,H3AsO4,is used industrially to manufacture insecticides.Arsenic acid is a polyprotic acid with K1 = 2.5 ×\times× 10-4,K2 = 5.6 ×\times× 10-8,and K3 = 3 ×\times× 10-13.What is the concentration of the HAsO42- in a solution whose initial arsenic acid concentration was 0.35 M?

Correct AnswerverifiedShow Answer

The substance H2SO3 is considered

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A solution of sodium acetate (CH₃COONa)in water is weakly basic.

Correct Answer
verified

A solution is prepared by adding 0.10 mol of sodium sulfide,Na₂S,to 1.00 L of water.Which statement about the solution is correct?

Correct Answer
verified

What is the [H₃O⁺] for a solution at 25°C that has pOH = 5.640?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the value of K_b for the cyanide anion,CN^-? K_a(HCN) = 6.2 $\times$ 10^-10

Correct Answer
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A 0.15 M solution of chloroacetic acid has a pH of 1.86.What is the value of K_a for this acid?

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the pH of a 0.0100 M sodium benzoate solution? K_b (C₇H₅O₂^-) = 1.5 $\times$ 10^-10

Correct Answer
verified

Farmers who raise cotton once used arsenic acid,H₃AsO₄,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with K₁ = 2.5 $\times$ 10^-4,K₂ = 5.6 $\times$ 10^-8,and K₃ = 3 $\times$ 10^-13.What is the pH of a 0.500 M solution of arsenic acid?

Correct Answer
verified

Formic acid,which is a component of insect venom,has a K_a = 1.8 $\times$ 10^-4.What is the [H₃O⁺] in a solution that is initially 0.10 M formic acid,HCOOH?

Correct Answer
verified

What is the pH of a 0.010 M triethanolammonium chloride, (HOC₂H₂) ₃NHCl,solution? K_b, ((HOC₂H₂) ₃N) = 5.9 $\times$ 10^-7

Correct Answer
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Correct Answer
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A 0.050 M solution of the weak acid HA has [H₃O⁺] = 3.77 $\times$ 10^-4 M.What is the K_a for the acid?

Correct Answer
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Correct Answer
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The substance H₂SO₃ is considered

Correct Answer
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