Question 1

Kw = 1.0 × 10-14 under all conditions.

Accepted Answer

A) True 
 B)False

Question 2

A solution is prepared by adding 0.10 mol of sodium fluoride,NaF,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 concentrations of fluoride ions and sodium ions are equal.
E)  The concentrations of hydronium ions and hydroxide ions are equal.F) A) and B)
G) None of the above

Question 3

Find the pH of a 0.20 M aqueous solution of dichloroacetic acid,for which Ka = 3.32 × 10-2.

Accepted Answer

A)  0.75
B)  2.71
C)  1.05
D)  2.35
E)  1.18F) B) and E)
G) C) and D)

Question 4

Consider the weak bases below and their Kb values: C6H7O- Kb = 1.3 × 10-10
C2H5NH2 Kb = 5.6 × 10-4
C5H5N Kb = 1.7 ×10-9
Arrange the conjugate acids of these weak bases in order of increasing acid strength.

Accepted Answer

A)  C5H5NH+6H7OH 2H5NH
B)  C6H7OH 5H5NH+ 2H5NH
C)  C5H5NH+2H5NH3+ 6H7OH
D)  C6H7OH 2H5NH3+5H5NH+
E)  C2H5NH3+5H5NH+ 6H7OHF) C) and D)
G) A) and B)

Question 5

In the reaction CaO(s) + SO2(g)  2(g)    CaSO3(s) , A) O2- acts as a Lewis base,and SO2 acts as a Lewis acid. B) Ca2+ acts as a Lewis base,and SO42- acts as a Lewis acid. C) SO32- acts as a Lewis base,and SO2 acts as a Lewis acid. D) SO2 acts as a Lewis base,and O2- acts as a Lewis acid. E) SO2 acts as a Lewis base,and Ca2+ acts as a Lewis acid." class="answers-bank-image d-inline" rel="preload" > CaSO3(s) ,

Accepted Answer

A)  O2- acts as a Lewis base,and SO2 acts as a Lewis acid.
B)  Ca2+ acts as a Lewis base,and SO42- acts as a Lewis acid.
C)  SO32- acts as a Lewis base,and SO2 acts as a Lewis acid.
D)  SO2 acts as a Lewis base,and O2- acts as a Lewis acid.
E)  SO2 acts as a Lewis base,and Ca2+ acts as a Lewis acid.F) All of the above
G) B) and D)

Question 6

Which is a Lewis acid but not a Brønsted acid?

Accepted Answer

A)  Fe3+
B)  H3O+
C)  HSO4-
D)  NH3
E)  H2OF) A) and B)
G) C) and D)

Question 7

What is the pH of a 0.050 M LiOH solution?

Accepted Answer

A)  1.30
B)  3.00
C)  11.00
D)  12.39
E)  12.70F) A) and E)
G) B) and D)

Question 8

Below is a representation of an aqueous solution of a weak acid HA at equilibrium.(Each circle represents 1.0 ×10-3 mol of atoms,and the volume of the box is 1.0 L.Solvent water molecules are not shown for clarity.)  -3 mol of atoms,and the volume of the box is 1.0 L.Solvent water molecules are not shown for clarity.)    What is Ka of HA? A) 1.0 ×10-6 B) 6.0 ×10-3 C) 2.5 ×10-4 D) 3.6 ×10-5 E) 1.0 ×10-9" class="answers-bank-image d-inline" rel="preload" > What is Ka of HA?

Accepted Answer

A)  1.0 ×10-6
B)  6.0 ×10-3
C)  2.5 ×10-4
D)  3.6 ×10-5
E)  1.0 ×10-9F) C) and E)
G) C) and D)

Question 9

Which one of the following is a strong acid?

Accepted Answer

A)  H2CO3
B)  H2SO3
C)  H2SO4
D)  H3PO4
E)  CH3COOHF) D) and E)
G) None of the above

Question 10

Which one of the following is a strong acid?

Accepted Answer

A)  CH3COOH
B)  H2SO3
C)  NH3
D)  H3PO4
E)  HClO3F) A) and E)
G) B) and C)

Question 11

Which is the strongest acid?

Accepted Answer

A)  HBrO3
B)  HFO3
C)  HIO3
D)  HClO3
E)  All are of equal strength.F) C) and E)
G) D) and E)

Question 12

Which aqueous solution has the highest pH?

Accepted Answer

A)  0.1 M CH3COOH,pKa = 4.7
B)  0.1 M CuCl2,pKa = 7.5
C)  0.1 M H3C6H5O7,pKa = 3.1
D)  0.1 M ZnCl2,pKa = 9.0
E)  pure waterF) A) and E)
G) None of the above

Question 13

The acid dissociation constant Ka equals 1.26 × 10-2 for HSO4- and is 5.6 × 10-10 for NH4+. Which statement about the following equilibrium is correct?
HSO4-(aq) + NH3(aq)  -2 for HSO4- and is 5.6 × 10-10 for NH4+. Which statement about the following equilibrium is correct? HSO4-(aq) + NH3(aq)    SO42-(aq) + NH4+(aq)  A) The reactants will be favored because ammonia is a stronger base than the sulfate anion. B) The products will be favored because the hydrogen sulfate ion is a stronger acid than the ammonium ion. C) Neither reactants nor products will be favored because all of the species are weak acids or bases. D) The initial concentrations of the hydrogen sulfate ion and ammonia must be known before any prediction can be made. E) This reaction is impossible to predict,since the strong acid and the weak base appear on the same side of the equation." class="answers-bank-image d-inline" rel="preload" > SO42-(aq) + NH4+(aq)

Accepted Answer

A)  The reactants will be favored because ammonia is a stronger base than the sulfate anion.
B)  The products will be favored because the hydrogen sulfate ion is a stronger acid than the ammonium ion.
C)  Neither reactants nor products will be favored because all of the species are weak acids or bases.
D)  The initial concentrations of the hydrogen sulfate ion and ammonia must be known before any prediction can be made.
E)  This reaction is impossible to predict,since the strong acid and the weak base appear on the same side of the equation.F) A) and E)
G) B) and D)

Question 14

Hard water deposits (calcium carbonate) have built up around your bathroom sink.Which of these substances would be most effective in dissolving the deposits?

Accepted Answer

A)  ammonia
B)  bleach (sodium hypochlorite) 
C)  lye (sodium hydroxide) 
D)  vinegar (acetic acid) E) None of the above
F) All of the above

Question 15

Weak acids have weak conjugate bases.

Accepted Answer

A) True 
 B)False

Question 16

What is [OH-] for a solution at 25°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)  2.35 ×10-3 MF) B) and D)
G) C) and D)

Question 17

The substance (CH3CH2) 2NH is considered to be

Accepted Answer

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

Question 18

Amphoteric oxides are compounds that exhibit both acidic and basic behavior.

Accepted Answer

A) True 
 B)False

Question 19

Which represents a weak base B with Kb= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)

Accepted Answer

A)   b= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   b= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   b= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   b= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   b= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) C) and E)
G) B) and D)

Question 20

What is the conjugate acid of the acetate ion?

Accepted Answer

A)  CH3O2-
B)  COOH
C)  HC2H3O2
D)  H2O
E)  CH4F) C) and E)
G) All of the above

Exam 16: Acids and Bases

The acid dissociation constant Ka equals 1.26 × 10-2 for HSO4- and is 5.6 × 10-10 for NH4+. Which statement about the following equilibrium is correct? HSO4-(aq) + NH3(aq) SO42-(aq) + NH4+(aq)

Correct AnswerverifiedShow Answer

Which represents a weak base B with Kb= 2 ×10-3? (Each circle represents 1.0 ×10-3 mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)

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Weak acids have weak conjugate bases.

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Consider the weak bases below and their Kb values: C6H7O- Kb = 1.3 × 10-10 C2H5NH2 Kb = 5.6 × 10-4 C5H5N Kb = 1.7 ×10-9 Arrange the conjugate acids of these weak bases in order of increasing acid strength.

Correct AnswerverifiedShow Answer

Which aqueous solution has the highest pH?

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What is the conjugate acid of the acetate ion?

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Which one of the following is a strong acid?

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Which one of the following is a strong acid?

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Kw = 1.0 × 10-14 under all conditions.

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Amphoteric oxides are compounds that exhibit both acidic and basic behavior.

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In the reaction CaO(s) + SO2(g) CaSO3(s) ,

Correct AnswerverifiedShow Answer

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

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Find the pH of a 0.20 M aqueous solution of dichloroacetic acid,for which Ka = 3.32 × 10-2.

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Which is the strongest acid?

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Below is a representation of an aqueous solution of a weak acid HA at equilibrium.(Each circle represents 1.0 ×10-3 mol of atoms,and the volume of the box is 1.0 L.Solvent water molecules are not shown for clarity.) What is Ka of HA?

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Hard water deposits (calcium carbonate) have built up around your bathroom sink.Which of these substances would be most effective in dissolving the deposits?

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The substance (CH3CH2) 2NH is considered to be

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What is [OH-] for a solution at 25°C that has [H3O+] = 2.35 × 10-3 M?

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Which is a Lewis acid but not a Brønsted acid?

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What is the pH of a 0.050 M LiOH solution?

Correct AnswerverifiedShow Answer

The acid dissociation constant Ka equals 1.26 × 10^-² for HSO₄^- and is 5.6 × 10^-¹⁰ for NH₄⁺. Which statement about the following equilibrium is correct? HSO₄^-(aq) + NH₃(aq) SO₄²^-(aq) + NH₄⁺(aq)

Correct Answer
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Which represents a weak base B with K_b= 2 ×10^-³? (Each circle represents 1.0 ×10^-³ mol of atoms,and the volume of each box is 1.0 L.Solvent water molecules are not shown for clarity.)

Correct Answer
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Consider the weak bases below and their K_b values: C₆H₇O^- K_b = 1.3 × 10^-10 C₂H₅NH₂ K_b = 5.6 × 10^-⁴ C₅H₅N K_b = 1.7 ×10^-⁹ Arrange the conjugate acids of these weak bases in order of increasing acid strength.

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K_w = 1.0 × 10^-¹⁴ under all conditions.

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In the reaction CaO(s) + SO₂(g) CaSO₃(s) ,

Correct Answer
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Find the pH of a 0.20 M aqueous solution of dichloroacetic acid,for which K_a = 3.32 × 10^-².

Correct Answer
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Below is a representation of an aqueous solution of a weak acid HA at equilibrium.(Each circle represents 1.0 ×10^-³ mol of atoms,and the volume of the box is 1.0 L.Solvent water molecules are not shown for clarity.) What is K_a of HA?

Correct Answer
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The substance (CH₃CH₂) ₂NH is considered to be

Correct Answer
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What is [OH^-] for a solution at 25°C that has [H₃O⁺] = 2.35 × 10^-3 M?

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