Question 1

The acid-base indicator phenolphthalein is colorless in acidic solutions and bright pink in basic solutions.

Accepted Answer

A) True 
 B)False

Question 2

Which species is a diprotic acid?

Accepted Answer

A) Mg(OH)2 
B) CH3COOH 
C) H2 
D) H2CO3 
A) Mg(OH)2 
B) CH3COOH 
C) H2 
D) H2CO3

Question 3

Consider two acids, A and B. If acid A is weaker than acid B, then acid B dissociates in water to a greater extent than acid A.

Accepted Answer

A) True 
 B)False

Question 4

A sample of water from the Chesapeake Bay has [H3O+]=3.1 × 10-9 M. Which statement below accurately describes this water sample?

Accepted Answer

A) The pH of the water sample is 7.5. 
B) The water sample is a basic solution. 
C) The water sample doesn't contain any hydroxide ions. 
D) The water sample has a higher concentration of hydronium ions than pure water does. 
A) The pH of the water sample is 7.5. 
B) The water sample is a basic solution. 
C) The water sample doesn't contain any hydroxide ions. 
D) The water sample has a higher concentration of hydronium ions than pure water does.

Question 5

An aqueous solution of NaHCO3 is basic.

Accepted Answer

A) True 
 B)False

Question 6

The reaction of a Brønsted-Lowry acid (HA)with the metal salt of a hydroxide base (MOH)is an example of a neutralization reaction-an acid-base reaction that produces a _____ and _____ as products.

Accepted Answer

The answer of The reaction of a Brønsted-Lowry acid (HA)with...

Question 7

The addition of a base to water decreases the pH of the solution.

Accepted Answer

A) True 
 B)False

Question 8

The stronger the acid, the (larger/smaller)_____ the value of Ka.

Accepted Answer

Question 9

When phosphoric acid (H3PO4)dissolves in water, the equilibrium shown below is established. If Ka = 7.5 × 10-3 for H3PO4, which statement concerning an aqueous solution of phosphoric acid is correct?
H3PO4 + H2O   H3O+ + H2PO4-

Accepted Answer

A) An aqueous solution of phosphoric acid contains mainly H3PO4 molecules. 
B) An aqueous solution of phosphoric acid contains predominantly H3O+ and H2PO4- ions. 
C) An aqueous solution of phosphoric acid contains equal amounts of H3O+ and H3PO4. 
D) An aqueous solution of phosphoric acid contains a greater concentration of dissolved ions than it does neutral phosphoric acid molecules. 
A) An aqueous solution of phosphoric acid contains mainly H3PO4 molecules. 
B) An aqueous solution of phosphoric acid contains predominantly H3O+ and H2PO4- ions. 
C) An aqueous solution of phosphoric acid contains equal amounts of H3O+ and H3PO4. 
D) An aqueous solution of phosphoric acid contains a greater concentration of dissolved ions than it does neutral phosphoric acid molecules.

Question 10

What is the pH of a buffer that contains 0.15 M CH3COOH and 0.10 M NaCH3COO (Ka = 1.8 × 10-5)?

Accepted Answer

A) 4.74 
B) 7.00 
C) 4.57 
D) 4.92 
A) 4.74 
B) 7.00 
C) 4.57 
D) 4.92

Question 11

Which species is the conjugate acid of HCO3-?

Accepted Answer

A) CO32- 
B) H2CO3 
C) CO2 
D) H2O 
A) CO32- 
B) H2CO3 
C) CO2 
D) H2O

Question 12

A Brønsted-Lowry base must contain a lone pair of electrons.

Accepted Answer

A) True 
 B)False

Question 13

A compound can be an acid or a base, but not both.

Accepted Answer

A) True 
 B)False

Question 14

Which acid is the strongest?

Accepted Answer

A) Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2) 
B) Hydrocyanic acid HCN (Ka = 4.9 × 10-10) 
C) Hydrofluoric acid HF (Ka = 7.2 × 10-4) 
D) Ammonium ion NH4+ (Ka = 5.6 × 10-10) 
A) Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2) 
B) Hydrocyanic acid HCN (Ka = 4.9 × 10-10) 
C) Hydrofluoric acid HF (Ka = 7.2 × 10-4) 
D) Ammonium ion NH4+ (Ka = 5.6 × 10-10)

Question 15

An Arrhenius acid is

Accepted Answer

A) a compound that contains hydroxide and dissolves in water to form OH-. 
B) a compound that is a proton donor. 
C) a compound that is a proton acceptor. 
D) a compound that contains a hydrogen atom and dissolves in water to form a hydrogen ion, H+. 
A) a compound that contains hydroxide and dissolves in water to form OH-. 
B) a compound that is a proton donor. 
C) a compound that is a proton acceptor. 
D) a compound that contains a hydrogen atom and dissolves in water to form a hydrogen ion, H+.

Question 16

Which compound is a weak acid?

Accepted Answer

A) HNO3 
B) HBr 
C) CH3COOH 
D) H2SO4 
A) HNO3 
B) HBr 
C) CH3COOH 
D) H2SO4

Question 17

The value of Kw applies to any aqueous solution at 25 °C , not just pure water.

Accepted Answer

A) True 
 B)False

Question 18

What is the conjugate base of the hydronium ion, H3O+?

Accepted Answer

A) OH- 
B) H2O- 
C) H2O 
D) H3O+ has no conjugate base 
A) OH- 
B) H2O- 
C) H2O 
D) H3O+ has no conjugate base

Question 19

The [H3O+] in a cabernet sauvignon wine is 5.9 × 10-4 M. What is the [-OH] in this wine?

Accepted Answer

A) 5.9 × 10-4 M -OH 
B) 1.0 × 10-7 M -OH 
C) 5.9 × 10-18 M -OH 
D) 1.7 × 10-11 M -OH 
E) 1.0 × 10-14 M -OH 
A) 5.9 × 10-4 M -OH 
B) 1.0 × 10-7 M -OH 
C) 5.9 × 10-18 M -OH 
D) 1.7 × 10-11 M -OH 
E) 1.0 × 10-14 M -OH

Question 20

Which salt forms a solution with a pH < 7 when dissolved in water?

Accepted Answer

A) RbI 
B) NaCH3COO 
C) LiNO2 
D) (NH4)2SO4 
A) RbI 
B) NaCH3COO 
C) LiNO2 
D) (NH4)2SO4

Exam 9: Acids and Bases

The acid-base indicator phenolphthalein is colorless in acidic solutions and bright pink in basic solutions.

Which species is a diprotic acid?

Consider two acids, A and B. If acid A is weaker than acid B, then acid B dissociates in water to a greater extent than acid A.

A sample of water from the Chesapeake Bay has [H3O+]=3.1 × 10-9 M. Which statement below accurately describes this water sample?

An aqueous solution of NaHCO3 is basic.

The reaction of a Brønsted-Lowry acid (HA)with the metal salt of a hydroxide base (MOH)is an example of a neutralization reaction-an acid-base reaction that produces a _____ and _____ as products.

The addition of a base to water decreases the pH of the solution.

The stronger the acid, the (larger/smaller)_____ the value of Ka.

When phosphoric acid (H3PO4)dissolves in water, the equilibrium shown below is established. If Ka = 7.5 × 10-3 for H3PO4, which statement concerning an aqueous solution of phosphoric acid is correct? H3PO4 + H2O H3O+ + H2PO4-

What is the pH of a buffer that contains 0.15 M CH3COOH and 0.10 M NaCH3COO (Ka = 1.8 × 10-5)?

Which species is the conjugate acid of HCO3-?

A Brønsted-Lowry base must contain a lone pair of electrons.

A compound can be an acid or a base, but not both.

Which acid is the strongest?

An Arrhenius acid is

Which compound is a weak acid?

The value of Kw applies to any aqueous solution at 25 °C , not just pure water.

What is the conjugate base of the hydronium ion, H3O+?

The [H3O+] in a cabernet sauvignon wine is 5.9 × 10-4 M. What is the [-OH] in this wine?

Which salt forms a solution with a pH < 7 when dissolved in water?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

Solutions

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

A sample of water from the Chesapeake Bay has [H₃O⁺]=3.1 × 10^-9 M. Which statement below accurately describes this water sample?

An aqueous solution of NaHCO₃ is basic.

The reaction of a Brønsted-Lowry acid (HA)with the metal salt of a hydroxide base (MOH)is an example of a neutralization reaction-an acid-base reaction that produces a _ and _ as products.

The stronger the acid, the (larger/smaller)_____ the value of K_a.

When phosphoric acid (H₃PO₄)dissolves in water, the equilibrium shown below is established. If K_a= 7.5 × 10^-3 for H₃PO₄, which statement concerning an aqueous solution of phosphoric acid is correct? H₃PO₄ + H₂O H₃O⁺ + H₂PO₄^-

What is the pH of a buffer that contains 0.15 M CH₃COOH and 0.10 M NaCH₃COO (K_a = 1.8 × 10^-5)?

Which species is the conjugate acid of HCO₃^-?

The value of K_w applies to any aqueous solution at 25 °C , not just pure water.

What is the conjugate base of the hydronium ion, H₃O⁺?

The [H₃O⁺] in a cabernet sauvignon wine is 5.9 × 10^-4M. What is the [^-OH] in this wine?