Question 1

If NaH2PO4 is added to water, what other compound or compounds could also be added in order to make a buffered solution?

Accepted Answer

A) H3PO4 only 
B) NaHPO4 only 
C) Na2HPO4 only 
D) Na2PO3 only 
E) either H3PO4 or Na2HPO4  
A) H3PO4 only 
B) NaHPO4 only 
C) Na2HPO4 only 
D) Na2PO3 only 
E) either H3PO4 or Na2HPO4

Question 2

Select the solution below that is the most acidic.

Accepted Answer

A) [H3O+] = 1.0 x 10-4 M 
B) [H3O+] = 1.0 x 10-6 M 
C) [H3O+] = 1.0 x 10-7 M 
D) [H3O+] = 1.0 x 10-8 M 
E) [H3O+] = 1.0 x 10-10 M 
A) [H3O+] = 1.0 x 10-4 M 
B) [H3O+] = 1.0 x 10-6 M 
C) [H3O+] = 1.0 x 10-7 M 
D) [H3O+] = 1.0 x 10-8 M 
E) [H3O+] = 1.0 x 10-10 M

Question 3

When the following reaction goes in the reverse direction (from products to reactants), what is the base? HCN(aq) + H2O(l) ⇌ CN-(aq) + H3O+(aq)

Accepted Answer

A) HCN 
B) H2O 
C) CN-  
D) H3O+  
E) both CN- and H3O+  
A) HCN 
B) H2O 
C) CN-  
D) H3O+  
E) both CN- and H3O+

Question 4

The image shows a molecular-level representation of part of a solution after ammonia, NH3, is dissolved in water.(Besides water, there are 2 NH4+ ions, 6 NH3 molecules, and 2 OH- ions present in the solution.).Which of the following best describes NH3?

Accepted Answer

A) strong acid 
B) strong base 
C) weak acid 
D) weak base 
E) amphoteric 
A) strong acid 
B) strong base 
C) weak acid 
D) weak base 
E) amphoteric

Question 5

Calculate the pH of a solution that has [H3O+] = 5.2 x 10-7 M.

Accepted Answer

A) pH = 5.20 
B) pH = 6.28 
C) pH = 7.00 
D) pH = 5.27 
E) pH = 7.72 
A) pH = 5.20 
B) pH = 6.28 
C) pH = 7.00 
D) pH = 5.27 
E) pH = 7.72

Question 6

Which of the following equations represents the behavior of H2PO4- as a base?

Accepted Answer

A) H2PO4-(aq) + H3O+(aq) ⇌ H3PO4(aq) + H2O(l) 
B) H2PO4-(aq) + F-(aq) ⇌ HPO42-(aq) + HF(aq) 
C) H2PO4-(aq) + CN-(aq) ⇌ HPO42-(aq) + HCN(aq) 
D) H2PO4-(aq) + OH-(aq) ⇌ HPO42-(aq) + H2O(l) 
E) H2PO4-(aq) + H2O(l) ⇌ H3PO4(aq) + H3O+(aq) 
A) H2PO4-(aq) + H3O+(aq) ⇌ H3PO4(aq) + H2O(l) 
B) H2PO4-(aq) + F-(aq) ⇌ HPO42-(aq) + HF(aq) 
C) H2PO4-(aq) + CN-(aq) ⇌ HPO42-(aq) + HCN(aq) 
D) H2PO4-(aq) + OH-(aq) ⇌ HPO42-(aq) + H2O(l) 
E) H2PO4-(aq) + H2O(l) ⇌ H3PO4(aq) + H3O+(aq)

Question 7

Which of the following will not change when an acid is added to water?

Accepted Answer

A) pH 
B) pOH 
C) Kw  
D) hydronium ion concentration 
E) hydroxide ion concentration 
A) pH 
B) pOH 
C) Kw  
D) hydronium ion concentration 
E) hydroxide ion concentration

Question 8

Which of the following acids is not normally found in foods or beverages?

Accepted Answer

A) citric acid 
B) acetic acid 
C) phosphoric acid 
D) carbonic acid 
E) sulfuric acid 
A) citric acid 
B) acetic acid 
C) phosphoric acid 
D) carbonic acid 
E) sulfuric acid

If NaH₂PO₄ is added to water, what other compound or compounds could also be added in order to make a buffered solution?

Select the solution below that is the most acidic.

When the following reaction goes in the reverse direction (from products to reactants), what is the base? HCN(aq) + H₂O(l) ⇌ CN^-(aq) + H₃O⁺(aq)

The image shows a molecular-level representation of part of a solution after ammonia, NH₃, is dissolved in water.(Besides water, there are 2 NH₄⁺ ions, 6 NH₃ molecules, and 2 OH^- ions present in the solution.).Which of the following best describes NH₃?

Calculate the pH of a solution that has [H₃O⁺] = 5.2 x 10^-7M.

Which of the following equations represents the behavior of H₂PO₄^- as a base?

Which of the following will not change when an acid is added to water?

Which of the following acids is not normally found in foods or beverages?

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Exam 13: Acids and Bases

If NaH2PO4 is added to water, what other compound or compounds could also be added in order to make a buffered solution?

Select the solution below that is the most acidic.

When the following reaction goes in the reverse direction (from products to reactants), what is the base? HCN(aq) + H2O(l) ⇌ CN-(aq) + H3O+(aq)

The image shows a molecular-level representation of part of a solution after ammonia, NH3, is dissolved in water.(Besides water, there are 2 NH4+ ions, 6 NH3 molecules, and 2 OH- ions present in the solution.).Which of the following best describes NH3?

Calculate the pH of a solution that has [H3O+] = 5.2 x 10-7 M.

Which of the following equations represents the behavior of H2PO4- as a base?

Which of the following will not change when an acid is added to water?

Which of the following acids is not normally found in foods or beverages?

Matter and Energy

Atoms, Ions, and the Periodic Table

Chemical Compounds

Chemical Composition

Chemical Reactions and Equations

Quantities in Chemical Reactions

Electron Structure of the Atom

Chemical Bonding

The Gaseous State

The Liquid and Solid States

Solutions

Reaction Rates and Chemical Equilibrium

Oxidation-Reduction Reactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

If NaH₂PO₄ is added to water, what other compound or compounds could also be added in order to make a buffered solution?

When the following reaction goes in the reverse direction (from products to reactants), what is the base? HCN(aq) + H₂O(l) ⇌ CN^-(aq) + H₃O⁺(aq)

The image shows a molecular-level representation of part of a solution after ammonia, NH₃, is dissolved in water.(Besides water, there are 2 NH₄⁺ ions, 6 NH₃ molecules, and 2 OH^- ions present in the solution.).Which of the following best describes NH₃?

Calculate the pH of a solution that has [H₃O⁺] = 5.2 x 10^-7M.

Which of the following equations represents the behavior of H₂PO₄^- as a base?