Question 1

The OH- concentration in a 1.0 × 10-3 M Ba(OH)2 solution is

Accepted Answer

A) 0.50 × 10-3 M. 
B) 1.0 × 10-3 M. 
C) 2.0 × 10-3 M. 
D) 1.0 × 10-2 M. 
E) 0.020 M. 
A) 0.50 × 10-3 M. 
B) 1.0 × 10-3 M. 
C) 2.0 × 10-3 M. 
D) 1.0 × 10-2 M. 
E) 0.020 M.

Question 2

Write the formula for the conjugate base of H3PO4

Accepted Answer

Question 3

Which one of these salts will form an acidic solution upon dissolving in water?

Accepted Answer

A) LiBr 
B) NaF 
C) NH4Br 
D) KOH 
E) NaCN 
A) LiBr 
B) NaF 
C) NH4Br 
D) KOH 
E) NaCN

Question 4

The pH of a Ba(OH)2 solution is 10.00.What is the H+ ion concentration of this solution?

Accepted Answer

A) 4.0 × 10-11 M 
B) 1.6 × 10-10 M 
C) 1.3 × 10-5 M 
D) 1.0 × 10-10 M 
E) 10.M 
A) 4.0 × 10-11 M 
B) 1.6 × 10-10 M 
C) 1.3 × 10-5 M 
D) 1.0 × 10-10 M 
E) 10.M

Question 5

Arrange the acids HBr, H2Se, and H3As in order of increasing acid strength.

Accepted Answer

A) HBr 2Se 3As 
B) HBr 3As 2Se 
C) H2Se 3As 3As 2Se 3As 2Se 
A) HBr 2Se 3As 
B) HBr 3As 2Se 
C) H2Se 3As 3As 2Se 3As 2Se

Question 6

A tablet of a common over-the-counter drug contains 200.mg of caffeine (C8H10N4O2).What is the pH of the solution resulting from the dissolution of two of these tablets in 225.mL of water? (For caffeine, Kb = 4.1 × 10-4.)

Accepted Answer

A) 2.76 
B) 7.67 
C) 10.96 
D) 6.33 
E) 11.24 
A) 2.76 
B) 7.67 
C) 10.96 
D) 6.33 
E) 11.24

Question 7

Which of the following is not a conjugate acid-base pair?

Accepted Answer

A) H2O and OH- 
B) H2O and H3O+ 
C) H3O+ and OH- 
D) HO2- and H2O2 
E) O22- and HO2- 
A) H2O and OH- 
B) H2O and H3O+ 
C) H3O+ and OH- 
D) HO2- and H2O2 
E) O22- and HO2-

Question 8

A 8.0 M solution of formic acid (HCOOH)is 0.47% ionized.What is the Ka of formic acid?

Accepted Answer

Question 9

Calculate the pOH of a solution containing 0.25 g of HCl in 800.mL of solution.

Accepted Answer

The answer of Calculate the pOH of a solution containing...

Question 10

If the pH of stomach acid is 1.0, what is the hydroxide ion concentration in this solution?

Accepted Answer

The answer of If the pH of stomach acid is...

Question 11

Predict the direction in which the equilibrium will lie for the reaction C6H5COO- + HF    
 C6H5COOH + F- .
Ka(C6H5COOH)= 6.5 × 10-5; Ka(HF)= 7.1 × 10-4

Accepted Answer

A) to the right 
B) to the left 
C) in the middle 
A) to the right 
B) to the left 
C) in the middle

Question 12

Calculate the pOH for a solution with [H3O+] = 2.5 x 10-5 M

Accepted Answer

A) 4.60 
B) 9.40 
C) 4.0 x 10-10 
D) 2.50 
E) 11.50 
A) 4.60 
B) 9.40 
C) 4.0 x 10-10 
D) 2.50 
E) 11.50

Question 13

If the pH of an acid rain storm is approximately 3.0, how many times greater is the [H+] in the rain than in a cup of coffee having a pH of 5.0?

Accepted Answer

A) 1000 
B) 100 
C) 20 
D) 1.7 
E) 0.60 
A) 1000 
B) 100 
C) 20 
D) 1.7 
E) 0.60

Question 14

Which of the following solutions is basic?

Accepted Answer

A) [OH-] = 1.0 x 10-14 M 
B) [OH-] = 1.0 x 10-7 M 
C) [H3O+] = 1.0 x 10-14 M 
D) [H3O+] > 1.0 x 10-7 M 
E) [OH-] -7 M 
A) [OH-] = 1.0 x 10-14 M 
B) [OH-] = 1.0 x 10-7 M 
C) [H3O+] = 1.0 x 10-14 M 
D) [H3O+] > 1.0 x 10-7 M 
E) [OH-] -7 M

Question 15

Which one of these statements about strong acids is true?

Accepted Answer

A) All strong acids have H atoms bonded to electronegative oxygen atoms. 
B) Strong acids are 100% ionized in water. 
C) The conjugate base of a strong acid is itself a strong base. 
D) Strong acids are very concentrated acids. 
E) Strong acids produce solutions with a higher pH than weak acids. 
A) All strong acids have H atoms bonded to electronegative oxygen atoms. 
B) Strong acids are 100% ionized in water. 
C) The conjugate base of a strong acid is itself a strong base. 
D) Strong acids are very concentrated acids. 
E) Strong acids produce solutions with a higher pH than weak acids.

Question 16

The pH of a 0.14 M solution of an unknown monoprotic acid is 5.85.Calculate the Ka of the acid.

Accepted Answer

A) 1.4 x 10-6 
B) 1.4 x 10-11 
C) 1.0 x 10-5 
D) 7.1 x 10-9 
E) 2.0 x 10-7 
A) 1.4 x 10-6 
B) 1.4 x 10-11 
C) 1.0 x 10-5 
D) 7.1 x 10-9 
E) 2.0 x 10-7

Question 17

What is the pH of a 0.30 M solution of HOCl (Ka = 3.5 x 10-8)

Accepted Answer

A) 7.45 
B) 6.54 
C) 7.98 
D) 5.22 
E) 3.99 
A) 7.45 
B) 6.54 
C) 7.98 
D) 5.22 
E) 3.99

Question 18

Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0.How many times greater is the H3O+ concentration in diet cola than in milk?

Accepted Answer

A) 2.3 times higher in diet cola than in milk 
B) 400 times higher in diet cola than in milk 
C) 0.43 times higher in diet cola than in milk 
D) 1,000 times higher in diet cola than in milk 
E) 10,000 times higher in diet cola than in milk 
A) 2.3 times higher in diet cola than in milk 
B) 400 times higher in diet cola than in milk 
C) 0.43 times higher in diet cola than in milk 
D) 1,000 times higher in diet cola than in milk 
E) 10,000 times higher in diet cola than in milk

Question 19

Will a 0.1 M solution of NH4CN(aq)be acidic, basic, or neutral?

Accepted Answer

Question 20

Calculate the pOH for a solution with [H3O+] = 3.1 x 10-9 M

Accepted Answer

A) 3.10 
B) 10.90 
C) 8.51 
D) 5.49 
E) 3.2 x 10-6 
A) 3.10 
B) 10.90 
C) 8.51 
D) 5.49 
E) 3.2 x 10-6

Exam 15: Acids and Bases

The OH- concentration in a 1.0 × 10-3 M Ba(OH)2 solution is

Write the formula for the conjugate base of H3PO4

Which one of these salts will form an acidic solution upon dissolving in water?

The pH of a Ba(OH)2 solution is 10.00.What is the H+ ion concentration of this solution?

Arrange the acids HBr, H2Se, and H3As in order of increasing acid strength.

A tablet of a common over-the-counter drug contains 200.mg of caffeine (C8H10N4O2).What is the pH of the solution resulting from the dissolution of two of these tablets in 225.mL of water? (For caffeine, Kb = 4.1 × 10-4.)

Which of the following is not a conjugate acid-base pair?

A 8.0 M solution of formic acid (HCOOH)is 0.47% ionized.What is the Ka of formic acid?

Calculate the pOH of a solution containing 0.25 g of HCl in 800.mL of solution.

If the pH of stomach acid is 1.0, what is the hydroxide ion concentration in this solution?

Predict the direction in which the equilibrium will lie for the reaction C6H5COO- + HF C6H5COOH + F- . Ka(C6H5COOH)= 6.5 × 10-5; Ka(HF)= 7.1 × 10-4

Calculate the pOH for a solution with [H3O+] = 2.5 x 10-5 M

If the pH of an acid rain storm is approximately 3.0, how many times greater is the [H+] in the rain than in a cup of coffee having a pH of 5.0?

Which of the following solutions is basic?

Which one of these statements about strong acids is true?

The pH of a 0.14 M solution of an unknown monoprotic acid is 5.85.Calculate the Ka of the acid.

What is the pH of a 0.30 M solution of HOCl (Ka = 3.5 x 10-8)

Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0.How many times greater is the H3O+ concentration in diet cola than in milk?

Will a 0.1 M solution of NH4CN(aq)be acidic, basic, or neutral?

Calculate the pOH for a solution with [H3O+] = 3.1 x 10-9 M

Chemistry: the Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

The OH^- concentration in a 1.0 × 10^-3 M Ba(OH)₂ solution is

Write the formula for the conjugate base of H₃PO₄

The pH of a Ba(OH)₂ solution is 10.00.What is the H⁺ ion concentration of this solution?

Arrange the acids HBr, H₂Se, and H₃As in order of increasing acid strength.

A tablet of a common over-the-counter drug contains 200.mg of caffeine (C₈H₁₀N₄O₂).What is the pH of the solution resulting from the dissolution of two of these tablets in 225.mL of water? (For caffeine, K_b = 4.1 × 10^-4.)

A 8.0 M solution of formic acid (HCOOH)is 0.47% ionized.What is the K_a of formic acid?

Predict the direction in which the equilibrium will lie for the reaction C₆H₅COO^- + HF C₆H₅COOH + F^-. K_a(C₆H₅COOH)= 6.5 × 10^-5; K_a(HF)= 7.1 × 10^-4

Calculate the pOH for a solution with [H₃O⁺] = 2.5 x 10^-5 M

If the pH of an acid rain storm is approximately 3.0, how many times greater is the [H⁺] in the rain than in a cup of coffee having a pH of 5.0?

The pH of a 0.14 M solution of an unknown monoprotic acid is 5.85.Calculate the K_aof the acid.

What is the pH of a 0.30 M solution of HOCl (K_a = 3.5 x 10^-8)

Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0.How many times greater is the H₃O⁺ concentration in diet cola than in milk?

Will a 0.1 M solution of NH₄CN(aq)be acidic, basic, or neutral?

Calculate the pOH for a solution with [H₃O⁺] = 3.1 x 10^-9 M