Question 1

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

Accepted Answer

A) NaI 
B) KI 
C) MgI2 
D) AlI3 
A) NaI 
B) KI 
C) MgI2 
D) AlI3

Question 2

What is the strongest acid among the following?

Accepted Answer

A) HF 
B) HCl 
C) HBr 
D) HI 
A) HF 
B) HCl 
C) HBr 
D) HI

Question 3

What is the pH of a 0.300 M NH3 solution that has Kb = 1.8 × 10-5? The equation for the dissociation of NH3 is NH3(aq)+ H2O(l)⇌ NH4+(aq)+ OH-(aq).

Accepted Answer

A) 2.11 
B) 2.63 
C) 11.89 
D) 11.37 
A) 2.11 
B) 2.63 
C) 11.89 
D) 11.37

Question 4

In order for the reaction HA + HSO3- ⇌ A- + H2SO3 to have an equilibrium constant Kc a of HA must be ________ (greater,less)than the Ka of HSO3-.

Accepted Answer

Question 5

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

Accepted Answer

A) RbCl 
B) NH4Cl 
C) SrCl2 
D) AlCl3 
A) RbCl 
B) NH4Cl 
C) SrCl2 
D) AlCl3

Question 6

What is the strongest acid among the following?

Accepted Answer

A) H2SO3 
B) H2SO4 
C) H2SeO2 
D) H2TeO4 
A) H2SO3 
B) H2SO4 
C) H2SeO2 
D) H2TeO4

Question 7

-Of the elements indicated on the periodic table shown above,which forms the weakest oxoacid acid with the formula H2XO3 or HXO3,where X = A,B,C,or D?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 8

A Br∅nsted-Lowry acid is best defined as a substance that can

Accepted Answer

A) accept an hydroxide ion. 
B) donate an hydroxide ion. 
C) accept a proton. 
D) donate a proton. 
A) accept an hydroxide ion. 
B) donate an hydroxide ion. 
C) accept a proton. 
D) donate a proton.

Question 9

Which of the following can be classified as a weak base?

Accepted Answer

A) CH3NH2 
B) NH2OH 
C) Both CH3NH2 and NH2OH 
D) Neither CH3NH2 nor NH2OH 
A) CH3NH2 
B) NH2OH 
C) Both CH3NH2 and NH2OH 
D) Neither CH3NH2 nor NH2OH

Question 10

An acidic solution at 25°C has

Accepted Answer

A) [H3O+] > [OH-] > 1 × 10-7 M. 
B) [H3O+] > 1 × 10-7 M > [OH-]. 
C) [H3O+] = [OH-] > 1 × 10-7 M. 
D) [H3O+] -7 M > [OH-]. 
A) [H3O+] > [OH-] > 1 × 10-7 M. 
B) [H3O+] > 1 × 10-7 M > [OH-]. 
C) [H3O+] = [OH-] > 1 × 10-7 M. 
D) [H3O+] -7 M > [OH-].

Question 11

Methylamine CH3NH2,has a base dissociation constant of 3.7 × 10-4.What is the conjugate acid of methylamine and what is its acid dissociation constant?

Accepted Answer

A) CH3NH3+,2.7 × 103 
B) CH3NH3+,3.7 × 10-4 
C) CH3NH3+,2.7 × 10-11 
D) CH3NH2-,2.7 × 10-11 
A) CH3NH3+,2.7 × 103 
B) CH3NH3+,3.7 × 10-4 
C) CH3NH3+,2.7 × 10-11 
D) CH3NH2-,2.7 × 10-11

Question 12

Which one of the following is least able to behave as a Lewis base?

Accepted Answer

A) CH3NH2 
B) (CH3)2NH 
C) (CH3)3N     
D) (CH3)2NCH2CH3+ 
A) CH3NH2 
B) (CH3)2NH 
C) (CH3)3N     
D) (CH3)2NCH2CH3+

Question 13

What is the approximate pH of a solution X that gives the following responses with the indicators shown?

Accepted Answer

A) 3.2 - 4.4 
B) 4.8 - 6.0 
C) 6.0 - 7.6 
D) 8.2 - 10.0 
A) 3.2 - 4.4 
B) 4.8 - 6.0 
C) 6.0 - 7.6 
D) 8.2 - 10.0

Question 14

For Cu2+ and CO2,which will behave as a Lewis acid toward OH- in water?

Accepted Answer

A) only Cu2+ 
B) only CO2 
C) Cu2+ and CO2 
D) neither Cu2+ nor CO2 
A) only Cu2+ 
B) only CO2 
C) Cu2+ and CO2 
D) neither Cu2+ nor CO2

Question 15

The value of Ka for a 0.250 M HCN solution having a pH of 4.956 is ________.

Accepted Answer

Question 16

Which one of the following species acts as a Br∅nsted-Lowry acid in water?

Accepted Answer

A) NaH 
B) NH4+ 
C) CH3NHCH3 
D) C6H6 
A) NaH 
B) NH4+ 
C) CH3NHCH3 
D) C6H6

Question 17

At 50°C the value of Kw is 5.5 × 10-14.A basic solution at 50°C has

Accepted Answer

A) [H3O+] -] -7 M. 
B) [H3O+] -7 M -]. 
C) [H3O+] = [OH-] -7 M. 
D) [H3O+] > 2 × 10-7 M -]. 
A) [H3O+] -] -7 M. 
B) [H3O+] -7 M -]. 
C) [H3O+] = [OH-] -7 M. 
D) [H3O+] > 2 × 10-7 M -].

Question 18

SO3 reacts with H2O to form H2SO4.Which picture below correctly represents the curved arrow notation for the initial Lewis acid-Lewis base interaction in this reaction;what is the Lewis acid and the Lewis base?

Accepted Answer

A) Picture (1)is correct;H2O is the Lewis acid and SO3 is the Lewis base. 
B) Picture (1)is correct;SO3 is the Lewis acid and H2O is the Lewis base. 
C) Picture (2)is correct;H2O is the Lewis acid and SO3 is the Lewis base. 
D) Picture (2)is correct;SO3 is the Lewis acid and H2O is the Lewis base. 
A) Picture (1)is correct;H2O is the Lewis acid and SO3 is the Lewis base. 
B) Picture (1)is correct;SO3 is the Lewis acid and H2O is the Lewis base. 
C) Picture (2)is correct;H2O is the Lewis acid and SO3 is the Lewis base. 
D) Picture (2)is correct;SO3 is the Lewis acid and H2O is the Lewis base.

Question 19

Which one of the following salts,when dissolved in water,produces the solution with a pH closest to 7.00?

Accepted Answer

A) NH4I  
B) Na2O 
C) KHCO3   
D) CsCl 
A) NH4I  
B) Na2O 
C) KHCO3   
D) CsCl

Question 20

Identify the Lewis acid that acts as a reactant in the following reaction. Co(H2O)63+(aq)+ 6 NH3(aq)→ Co(NH3)63+(aq)+ 6 H2O(l)

Accepted Answer

A) Co(H2O)63+ 
B) Co3+ 
C) NH3 
D) H2O 
A) Co(H2O)63+ 
B) Co3+ 
C) NH3 
D) H2O

Exam 15: Aqueous Equilibria: Acids and Bases

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

What is the strongest acid among the following?

What is the pH of a 0.300 M NH3 solution that has Kb = 1.8 × 10-5? The equation for the dissociation of NH3 is NH3(aq)+ H2O(l)⇌ NH4+(aq)+ OH-(aq).

In order for the reaction HA + HSO3- ⇌ A- + H2SO3 to have an equilibrium constant Kc < 1,the Ka of HA must be ________ (greater,less)than the Ka of HSO3-.

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

What is the strongest acid among the following?

-Of the elements indicated on the periodic table shown above,which forms the weakest oxoacid acid with the formula H2XO3 or HXO3,where X = A,B,C,or D?

A Br∅nsted-Lowry acid is best defined as a substance that can

Which of the following can be classified as a weak base?

An acidic solution at 25°C has

Methylamine CH3NH2,has a base dissociation constant of 3.7 × 10-4.What is the conjugate acid of methylamine and what is its acid dissociation constant?

Which one of the following is least able to behave as a Lewis base?

What is the approximate pH of a solution X that gives the following responses with the indicators shown?

For Cu2+ and CO2,which will behave as a Lewis acid toward OH- in water?

The value of Ka for a 0.250 M HCN solution having a pH of 4.956 is ________.

Which one of the following species acts as a Br∅nsted-Lowry acid in water?

At 50°C the value of Kw is 5.5 × 10-14.A basic solution at 50°C has

SO3 reacts with H2O to form H2SO4.Which picture below correctly represents the curved arrow notation for the initial Lewis acid-Lewis base interaction in this reaction;what is the Lewis acid and the Lewis base?

Which one of the following salts,when dissolved in water,produces the solution with a pH closest to 7.00?

Identify the Lewis acid that acts as a reactant in the following reaction. Co(H2O)63+(aq)+ 6 NH3(aq)→ Co(NH3)63+(aq)+ 6 H2O(l)

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What is the pH of a 0.300 M NH₃ solution that has K_b = 1.8 × 10^-5? The equation for the dissociation of NH₃ is NH₃(aq)+ H₂O(l)⇌ NH₄⁺(aq)+ OH^-(aq).

In order for the reaction HA + HSO₃^- ⇌ A^- + H₂SO₃ to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of HSO₃^-.

-Of the elements indicated on the periodic table shown above,which forms the weakest oxoacid acid with the formula H₂XO₃ or HXO₃,where X = A,B,C,or D?

Methylamine CH₃NH₂,has a base dissociation constant of 3.7 × 10^-4.What is the conjugate acid of methylamine and what is its acid dissociation constant?

For Cu²⁺ and CO₂,which will behave as a Lewis acid toward OH^- in water?

The value of K_a for a 0.250 M HCN solution having a pH of 4.956 is ________.

At 50°C the value of K_w is 5.5 × 10^-14.A basic solution at 50°C has

SO₃ reacts with H₂O to form H₂SO₄.Which picture below correctly represents the curved arrow notation for the initial Lewis acid-Lewis base interaction in this reaction;what is the Lewis acid and the Lewis base?

Identify the Lewis acid that acts as a reactant in the following reaction. Co(H₂O)₆³⁺(aq)+ 6 NH₃(aq)→ Co(NH₃)₆³⁺(aq)+ 6 H₂O(l)