Question 1

Identify from the following list of molecules and ions which behave as Lewis acids: CO2,NH3,BCl3,Fe3+.

Accepted Answer

A)   CO2 and NH3
B)   NH3 and BCl3
C)   CO2 and Fe3+
D)   CO2,BCl3,and Fe3+
E)   CO2,NH3,BCl3,and Fe3+

Question 2

A molecule that can behave as either a Brønsted-Lowry acid or base is termed ________.

Accepted Answer

amphiproti...

Question 3

What is the hydronium-ion concentration of a 0.25 M solution of HCN (Ka = 4.9  ×	imes×  10-10) at 25°C?

Accepted Answer

A)   1.6  ×	imes×  10-4 M
B)   3.3  ×	imes×  10-6 M
C)   2.1  ×	imes×  10-6 M
D)   1.1  ×	imes×  10-5 M
E)   4.4  ×	imes×  10-5 M

Question 4

What is the H3O+ concentration in 0.0042 M Ba(OH) 2(aq) at 25  ∘\circ∘ C? (Kw = 1.01  ×	imes×  10-14) ?

Accepted Answer

A)   8.4  ×	imes×  10-3 M
B)   4.2  ×	imes×  10-3 M
C)   1.2  ×	imes×  10-12 M
D)   2.4  ×	imes×  10-12 M
E)   1.0  ×	imes×  10-7 M

Question 5

What is the equilibrium constant for the following reaction,
HCO2H(aq) + CN-(aq)  2H(aq) + CN-(aq)    HCO2-(aq) + HCN(aq)   And does the reaction favor the formation of reactants or products? The acid dissociation constant,Ka,for HCO2H is 1.8  	imes  10-4 and the acid dissociation constant for HCN is 4.0  	imes 10-10. A)  K = 1.00.The reaction favors neither the formation of reactants nor products. B)  K = 2.2  	imes  10-6.The reaction favors the formation of products. C)  K = 2.2  	imes  10-6.The reaction favors the formation of reactants. D)  K = 4.5  	imes  105.The reaction favors the formation of products. E)  K = 4.5  	imes  105.The reaction favors the formation of reactants. " class="answers-bank-image d-inline" rel="preload" > HCO2-(aq) + HCN(aq)

And does the reaction favor the formation of reactants or products? The acid dissociation constant,Ka,for HCO2H is 1.8  ×	imes×  10-4 and the acid dissociation constant for HCN is 4.0  ×	imes× 10-10.

Accepted Answer

A)   K = 1.00.The reaction favors neither the formation of reactants nor products.
B)   K = 2.2  ×	imes×  10-6.The reaction favors the formation of products.
C)   K = 2.2  ×	imes×  10-6.The reaction favors the formation of reactants.
D)   K = 4.5  ×	imes×  105.The reaction favors the formation of products.
E)   K = 4.5  ×	imes×  105.The reaction favors the formation of reactants.

Question 6

Which of the following species   cannot ‾\underline{	ext{ cannot  }} cannot ​ act as a Lewis base?

Accepted Answer

A)   S2-
B)   H2S
C)   NH3
D)   CH4
E)   SH-

Question 7

Consider the reaction
 CO32-(aq) + H2O(l)  32-(aq) + H2O(l)    HCO3-(aq) + OH-(aq) .Kb for CO32- is 2.1  	imes  10-4 at 25°C. What is Ka for the HCO3- ion at 25°C? A)  4.8  	imes  103 B)  4.8  	imes  10-11 C)  2.1  	imes  10-4 D)  7.2  	imes  10-12 E)  9.2  	imes  10-8 " class="answers-bank-image d-inline" rel="preload" > HCO3-(aq) + OH-(aq) .Kb for CO32- is 2.1  ×	imes×  10-4 at 25°C.
What is Ka for the HCO3- ion at 25°C?

Accepted Answer

A)   4.8  ×	imes×  103
B)   4.8  ×	imes×  10-11
C)   2.1  ×	imes×  10-4
D)   7.2  ×	imes×  10-12
E)   9.2  ×	imes×  10-8

Question 8

The pH of aqueous 0.10 M pyridine (C5H5N) ion is 9.09.What is the Kb of this base?

Accepted Answer

A)   8.0  ×	imes×  10-10
B)   1.5  ×	imes×  10-9
C)   9.0  ×	imes×  10-6
D)   1.6  ×	imes×  10-5
E)   1.2  ×	imes×  10-5

Question 9

Write a net ionic equation for the neutralization reaction of hydrochloric acid and potassium hydroxide.Identify the spectator ion(s).

Accepted Answer

Net ionic equation: ...

Question 10

Consider the Ka values for the following acids:
Cyanic acid,HOCN,3.5  ×	imes×  10-4
Formic acid,HCHO2,1.7  ×	imes×  10-4
Lactic acid,HC3H5O3,1.3  ×	imes×  10-4
Propionic acid,HC3H5O2,1.3  ×	imes×  10-5
Benzoic acid,HC7H5O2,6.3  ×	imes×  10-5
Given initially equimolar solutions of each weak acid,which solution will have the highest pH once equilibrium is established?

Accepted Answer

A)   HOCN
B)   HC7H5O2
C)   HC3H5O2
D)   HC3H5O3
E)   HCHO2

Question 11

The autoionization of pure water,as represented by the equation below,is known to be endothermic ( Δ\DeltaΔ rH > 0.Which of the following correctly states what occurs as the temperature of pure water is raised?
H2O(l) + H2O(l)  rH > 0.Which of the following correctly states what occurs as the temperature of pure water is raised? H2O(l) + H2O(l)    H3O+(aq) + OH-(aq)  \Delta rH > 0 A)  Kw decreases,and the hydronium ion concentration decreases. B)  Kw decreases,and the hydronium ion concentration increases. C)  Kw and the hydronium ion concentration do not change. D)  Kw increases,and the hydronium ion concentration decreases. E)  Kw increases,and the hydronium ion concentration increases. " class="answers-bank-image d-inline" rel="preload" > H3O+(aq) + OH-(aq)  Δ\DeltaΔ rH > 0

Accepted Answer

A)   Kw decreases,and the hydronium ion concentration decreases.
B)   Kw decreases,and the hydronium ion concentration increases.
C)   Kw and the hydronium ion concentration do not change.
D)   Kw increases,and the hydronium ion concentration decreases.
E)   Kw increases,and the hydronium ion concentration increases.

Question 12

Which is NOT an amphiprotic species in water?

Accepted Answer

A)   HClO3
B)   HSO3-
C)   H3O+
D)   HS-
E)   HCO3-

Question 13

What is the equilibrium pH of a 0.835 M solution of H3PO4(aq) ? (Ka1 = 7.5  ×	imes×   10-3,Ka2 = 6.2  ×	imes×  10-8,Ka3 = 4.8  ×	imes×  10-13)

Accepted Answer

A)   1.12
B)   3.64
C)   12.32
D)   6.20
E)   7.21

Question 14

A solution has a hydroxide-ion concentration of 0.0030 M.What is the pOH of the solution at 25  ∘\circ∘ C? (Kw = 1.01  ×	imes×  10-14)

Accepted Answer

A)   11.48
B)   2.52
C)   7.00
D)   8.19
E)   5.81

Question 15

Which ionic compound forms a pH-neutral aqueous solution at 25  ∘\circ∘ C?

Accepted Answer

A)   KHCO3
B)   LiCl
C)   KOCl
D)   NH4Cl
E)   K2S

Question 16

Which is the stronger Brønsted-Lowry acid,Fe(H2O)62+ or Fe(H2O)63+? Explain.

Accepted Answer

Fe(H₂O)₆³⁺.When a proton dissociates from th...

Question 17

At 25  ∘\circ∘ C,all of the following ions produce an acidic solution,except ____.

Accepted Answer

A)   NH4+
B)   HSO3-
C)   HPO42-
D)   [Fe(H2O) 6]3+
E)   [Al(H2O) 6]3+

Question 18

Molecules or ions that can alternately behave as either a Brønsted-Lowry acid or base are called

Accepted Answer

A)   polyanions.
B)   hydronium ions.
C)   polyprotic acids or bases.
D)   conjugate acids or bases.
E)   amphiprotic.

Question 19

Which of the following is the strongest acid in aqueous solution?

Accepted Answer

A)   H3AsO4
B)   H3PO4
C)   H3PO3
D)   H3SbO4
E)   H3AsO3

Question 20

What is Ka at 25°C for the following equilibrium given Kb (CH3NH2) = 4.4  ×	imes×  10-4 at 25°C.?
CH3NH3+(aq) + H2O(l)  a at 25°C for the following equilibrium given Kb (CH3NH2) = 4.4  	imes  10-4 at 25°C.? CH3NH3+(aq) + H2O(l)    CH3NH2(aq) + H3O+(aq)  A)  4.4  	imes  10-4 B)  2.3  	imes  103 C)  4.4  	imes  10-10 D)  4.4  	imes  104 E)  2.3  	imes  10-11 " class="answers-bank-image d-inline" rel="preload" > CH3NH2(aq) + H3O+(aq)

Accepted Answer

A)   4.4  ×	imes×  10-4
B)   2.3  ×	imes×  103
C)   4.4  ×	imes×  10-10
D)   4.4  ×	imes×  104
E)   2.3  ×	imes×  10-11

Exam 17: The Chemistry of Acids and Bases

The pH of aqueous 0.10 M pyridine (C₅H₅N) ion is 9.09.What is the K_b of this base?

Correct Answer
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Which is NOT an amphiprotic species in water?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A molecule that can behave as either a Brønsted-Lowry acid or base is termed ________.

Correct Answer
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amphiproti...
View Answer

Identify from the following list of molecules and ions which behave as Lewis acids: CO₂,NH₃,BCl₃,Fe³⁺.

Correct Answer
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What is the equilibrium pH of a 0.835 M solution of H₃PO₄(aq) ? (K_a1 = 7.5 $\times$ 10^-3,K_a2 = 6.2 $\times$ 10^-8,K_a3 = 4.8 $\times$ 10^-13)

Correct Answer
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Correct Answer
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Write a net ionic equation for the neutralization reaction of hydrochloric acid and potassium hydroxide.Identify the spectator ion(s).

Correct Answer
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Net ionic equation: ...
View Answer

What is the H₃O⁺ concentration in 0.0042 M Ba(OH) ₂(aq) at 25 ^$\circ$C? (K_w = 1.01 $\times$ 10^-14) ?

Correct Answer
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A solution has a hydroxide-ion concentration of 0.0030 M.What is the pOH of the solution at 25 ^$\circ$C? (K_w = 1.01 $\times$ 10^-14)

Correct Answer
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Correct Answer
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At 25 ^$\circ$C,all of the following ions produce an acidic solution,except ____.

Correct Answer
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Which is the stronger Brønsted-Lowry acid,Fe(H₂O)₆²⁺ or Fe(H₂O)₆³⁺? Explain.

Correct Answer
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Fe(H₂O)₆³⁺.When a proton dissociates from th...
View Answer

Which of the following is the strongest acid in aqueous solution?

Correct Answer
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Which ionic compound forms a pH-neutral aqueous solution at 25 ^$\circ$C?

Correct Answer
verified

Molecules or ions that can alternately behave as either a Brønsted-Lowry acid or base are called

Correct Answer
verified

What is the hydronium-ion concentration of a 0.25 M solution of HCN (K_a = 4.9 $\times$ 10^-10) at 25°C?

Correct Answer
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Which of the following species $\underline{\text{ cannot }}$ act as a Lewis base?

Correct Answer
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Exam 17: The Chemistry of Acids and Bases

The pH of aqueous 0.10 M pyridine (C5H5N) ion is 9.09.What is the Kb of this base?

Correct AnswerverifiedShow Answer

Which is NOT an amphiprotic species in water?

Correct AnswerverifiedShow Answer

Consider the reaction CO32-(aq) + H2O(l) HCO3-(aq) + OH-(aq) .Kb for CO32- is 2.1 ×\times× 10-4 at 25°C. What is Ka for the HCO3- ion at 25°C?

Correct AnswerverifiedShow Answer

What is Ka at 25°C for the following equilibrium given Kb (CH3NH2) = 4.4 ×\times× 10-4 at 25°C.? CH3NH3+(aq) + H2O(l) CH3NH2(aq) + H3O+(aq)

Correct AnswerverifiedShow Answer

The autoionization of pure water,as represented by the equation below,is known to be endothermic ( Δ\DeltaΔ rH > 0.Which of the following correctly states what occurs as the temperature of pure water is raised? H2O(l) + H2O(l) H3O+(aq) + OH-(aq) Δ\DeltaΔ rH > 0

Correct AnswerverifiedShow Answer

A molecule that can behave as either a Brønsted-Lowry acid or base is termed ________.

Correct Answerverifiedamphiproti...View AnswerShow Answer

Identify from the following list of molecules and ions which behave as Lewis acids: CO2,NH3,BCl3,Fe3+.

Correct AnswerverifiedShow Answer

What is the equilibrium pH of a 0.835 M solution of H3PO4(aq) ? (Ka1 = 7.5 ×\times× 10-3,Ka2 = 6.2 ×\times× 10-8,Ka3 = 4.8 ×\times× 10-13)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Write a net ionic equation for the neutralization reaction of hydrochloric acid and potassium hydroxide.Identify the spectator ion(s).

Correct AnswerverifiedNet ionic equation: ...View AnswerShow Answer

What is the H3O+ concentration in 0.0042 M Ba(OH) 2(aq) at 25 ∘\circ∘ C? (Kw = 1.01 ×\times× 10-14) ?

Correct AnswerverifiedShow Answer

A solution has a hydroxide-ion concentration of 0.0030 M.What is the pOH of the solution at 25 ∘\circ∘ C? (Kw = 1.01 ×\times× 10-14)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

At 25 ∘\circ∘ C,all of the following ions produce an acidic solution,except ____.

Correct AnswerverifiedShow Answer

Which is the stronger Brønsted-Lowry acid,Fe(H2O)62+ or Fe(H2O)63+? Explain.

Correct AnswerverifiedFe(H2O)63+.When a proton dissociates from th...View AnswerShow Answer

Which of the following is the strongest acid in aqueous solution?

Correct AnswerverifiedShow Answer

Which ionic compound forms a pH-neutral aqueous solution at 25 ∘\circ∘ C?

Correct AnswerverifiedShow Answer

Molecules or ions that can alternately behave as either a Brønsted-Lowry acid or base are called

Correct AnswerverifiedShow Answer

What is the hydronium-ion concentration of a 0.25 M solution of HCN (Ka = 4.9 ×\times× 10-10) at 25°C?

Correct AnswerverifiedShow Answer

Which of the following species cannot ‾\underline{\text{ cannot }} cannot ​ act as a Lewis base?

Correct AnswerverifiedShow Answer

The pH of aqueous 0.10 M pyridine (C₅H₅N) ion is 9.09.What is the K_b of this base?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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amphiproti...
View Answer

Identify from the following list of molecules and ions which behave as Lewis acids: CO₂,NH₃,BCl₃,Fe³⁺.

Correct Answer
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What is the equilibrium pH of a 0.835 M solution of H₃PO₄(aq) ? (K_a1 = 7.5 $\times$ 10^-3,K_a2 = 6.2 $\times$ 10^-8,K_a3 = 4.8 $\times$ 10^-13)

Correct Answer
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Correct Answer
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Correct Answer
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Net ionic equation: ...
View Answer

What is the H₃O⁺ concentration in 0.0042 M Ba(OH) ₂(aq) at 25 ^$\circ$C? (K_w = 1.01 $\times$ 10^-14) ?

Correct Answer
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A solution has a hydroxide-ion concentration of 0.0030 M.What is the pOH of the solution at 25 ^$\circ$C? (K_w = 1.01 $\times$ 10^-14)

Correct Answer
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Correct Answer
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At 25 ^$\circ$C,all of the following ions produce an acidic solution,except ____.

Correct Answer
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Which is the stronger Brønsted-Lowry acid,Fe(H₂O)₆²⁺ or Fe(H₂O)₆³⁺? Explain.

Correct Answer
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Fe(H₂O)₆³⁺.When a proton dissociates from th...
View Answer

Correct Answer
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Which ionic compound forms a pH-neutral aqueous solution at 25 ^$\circ$C?

Correct Answer
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Correct Answer
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What is the hydronium-ion concentration of a 0.25 M solution of HCN (K_a = 4.9 $\times$ 10^-10) at 25°C?

Correct Answer
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Which of the following species $\underline{\text{ cannot }}$ act as a Lewis base?

Correct Answer
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