Question 1

If the pH of pure water is 7.0, what is the hydroxide ion concentration in pure water?

Accepted Answer

1 * 10<sup

Question 2

Calculate the H+ ion concentration in a solution with a pH of 3.85.

Accepted Answer

1.4 * 10<s

Question 3

What concentration of potassium hydroxide will result from the reaction of 0.170 g of potassium with 100. mL of water?

Accepted Answer

4.35 * 10<

Question 4

The OH- concentration in a 2.5 * 10-3 M Ba(OH)2 solution is

Accepted Answer

A) 4.0 * 10-12 M. 
B) 2.5 * 10-3 M. 
C) 5.0 * 10-3 M. 
D) 1.2 * 10-2 M. 
E) 0.025 M. 
A) 4.0 * 10-12 M. 
B) 2.5 * 10-3 M. 
C) 5.0 * 10-3 M. 
D) 1.2 * 10-2 M. 
E) 0.025 M.

Question 5

The pH of a certain solution is 3.0. How many H+(aq)ions are there in 1.0 L of the solution?

Accepted Answer

A) 0.001 ions 
B) 1,000 ions 
C) 6. * 1020 ions 
D) 3 ions 
E) 6. * 1026 ions 
A) 0.001 ions 
B) 1,000 ions 
C) 6. * 1020 ions 
D) 3 ions 
E) 6. * 1026 ions

Question 6

In the reaction CaO(s)+ SO2(g)$\rarr$ CaSO3(s),

Accepted Answer

A) O2- acts as a Lewis base, and SO2 acts as a Lewis acid. 
B) Ca2+ acts as a Lewis base, and SO42- acts as a Lewis acid. 
C) SO42- acts as a Lewis base, and SO2 acts as a Lewis acid. 
D) SO2 acts as a Lewis base, and O2- acts as a Lewis acid. 
E) SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid. 
A) O2- acts as a Lewis base, and SO2 acts as a Lewis acid. 
B) Ca2+ acts as a Lewis base, and SO42- acts as a Lewis acid. 
C) SO42- acts as a Lewis base, and SO2 acts as a Lewis acid. 
D) SO2 acts as a Lewis base, and O2- acts as a Lewis acid. 
E) SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid.

Question 7

What mass of potassium hypochlorite must be added to 450. mL of water to give a solution with pH = 10.20? [Ka(HClO)= 4.0 * 10-8]

Accepted Answer

A) 20. g 
B) 0.032 g 
C) 4.1 g 
D) 2.4 g 
E) 9.1 g 
A) 20. g 
B) 0.032 g 
C) 4.1 g 
D) 2.4 g 
E) 9.1 g

Question 8

Calculate the H+ ion concentration in lemon juice having a pH of 2.4.

Accepted Answer

A) 4.0 * 10-2 M 
B) 250 M 
C) 0.38 M 
D) 4.0 * 10-3 M 
E) 12 M 
A) 4.0 * 10-2 M 
B) 250 M 
C) 0.38 M 
D) 4.0 * 10-3 M 
E) 12 M

Question 9

What volume of hydrogen, at STP, will be formed by the reaction of 0.170 g of potassium with 100. mL of water?

Accepted Answer

4.87 * 10<

Question 10

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 11

Which one of these salts will form a basic solution on dissolving in water?

Accepted Answer

A) NaCl 
B) KCN 
C) NaNO3 
D) NH4NO3 
E) FeCl3 
A) NaCl 
B) KCN 
C) NaNO3 
D) NH4NO3 
E) FeCl3

Question 12

The equilibrium constant for the reaction C7H15COOH(aq)+ HCOO-(aq)$\rarr$ C7H15COO-(aq)+ HCOOH(aq)
Is 7.23 * 10-2 at 25°C. If Ka for formic acid (HCOOH)is 1.77 * 10-4, what is the acid dissociation constant for C7H15COOH?

Accepted Answer

A) 2.45 * 10-3 
B) 4.08 * 10-2 
C) 7.81 * 10-4 
D) 1.00 * 10-4 
E) 1.28 * 10-5 
A) 2.45 * 10-3 
B) 4.08 * 10-2 
C) 7.81 * 10-4 
D) 1.00 * 10-4 
E) 1.28 * 10-5

Question 13

A 0.14 M HNO2 solution is 5.7% ionized. Calculate the H+ ion concentration.

Accepted Answer

A) 8.0 * 10-3 M 
B) 0.057 M 
C) 0.13 M 
D) 0.14 M 
E) 0.80 M 
A) 8.0 * 10-3 M 
B) 0.057 M 
C) 0.13 M 
D) 0.14 M 
E) 0.80 M

Question 14

Al(OH)3 is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with KOH.

Accepted Answer

Al(OH)<sub

Question 15

In aqueous solutions at 25°C, the sum of the ion concentrations ([H+] + [OH -])equals 1 * 10 - 14.

Accepted Answer

A) True 
 B)False

Question 16

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- $\rarr$ H2PO4- + HNO3 Ka(H3PO4)= 7.5 * 10-3

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 17

Identify the conjugate base of HCO3- in the reaction CO32- + HSO4- $\rarr$HCO3- + SO42-

Accepted Answer

A) HSO4- 
B) CO32- 
C) OH- 
D) H3O+ 
E) SO42- 
A) HSO4- 
B) CO32- 
C) OH- 
D) H3O+ 
E) SO42-

Question 18

In the reaction HNO3 + NH3 $\rarr$ NH4+ + NO3-, NH4+ and NH3 are a conjugate acid-base pair.

Accepted Answer

A) True 
 B)False

Question 19

What is the concentration of H+ in a 2.5 M HCl solution?

Accepted Answer

A) 0 
B) 1.3 M 
C) 2.5 M 
D) 5.0 M 
E) 10. M 
A) 0 
B) 1.3 M 
C) 2.5 M 
D) 5.0 M 
E) 10. M

Question 20

Write the chemical formula for nitric acid.

Accepted Answer

The answer of Write the chemical formula for nitric acid....

Exam 16: Acids and Bases

If the pH of pure water is 7.0, what is the hydroxide ion concentration in pure water?

Calculate the H+ ion concentration in a solution with a pH of 3.85.

What concentration of potassium hydroxide will result from the reaction of 0.170 g of potassium with 100. mL of water?

The OH- concentration in a 2.5 * 10-3 M Ba(OH)2 solution is

The pH of a certain solution is 3.0. How many H+(aq)ions are there in 1.0 L of the solution?

In the reaction CaO(s)+ SO2(g) →\rarr→ CaSO3(s),

What mass of potassium hypochlorite must be added to 450. mL of water to give a solution with pH = 10.20? [Ka(HClO)= 4.0 * 10-8]

Calculate the H+ ion concentration in lemon juice having a pH of 2.4.

What volume of hydrogen, at STP, will be formed by the reaction of 0.170 g of potassium with 100. mL of water?

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 one of these salts will form a basic solution on dissolving in water?

The equilibrium constant for the reaction C7H15COOH(aq)+ HCOO-(aq) →\rarr→ C7H15COO-(aq)+ HCOOH(aq) Is 7.23 * 10-2 at 25°C. If Ka for formic acid (HCOOH)is 1.77 * 10-4, what is the acid dissociation constant for C7H15COOH?

A 0.14 M HNO2 solution is 5.7% ionized. Calculate the H+ ion concentration.

Al(OH)3 is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with KOH.

In aqueous solutions at 25°C, the sum of the ion concentrations ([H+] + [OH -])equals 1 * 10 - 14.

Predict the direction in which the equilibrium will lie for the reaction H3PO4 + NO3- →\rarr→ H2PO4- + HNO3 Ka(H3PO4)= 7.5 * 10-3

Identify the conjugate base of HCO3- in the reaction CO32- + HSO4- →\rarr→ HCO3- + SO42-

In the reaction HNO3 + NH3 →\rarr→ NH4+ + NO3-, NH4+ and NH3 are a conjugate acid-base pair.

What is the concentration of H+ in a 2.5 M HCl solution?

Write the chemical formula for nitric acid.

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Calculate the H⁺ ion concentration in a solution with a pH of 3.85.

The OH^- concentration in a 2.5 * 10^-3 M Ba(OH)₂ solution is

The pH of a certain solution is 3.0. How many H⁺(aq)ions are there in 1.0 L of the solution?

In the reaction CaO(s)+ SO₂(g) $\rarr$ CaSO₃(s),

What mass of potassium hypochlorite must be added to 450. mL of water to give a solution with pH = 10.20? [K_a(HClO)= 4.0 * 10^-8]

Calculate the H⁺ ion concentration in lemon juice having a pH of 2.4.

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.)

The equilibrium constant for the reaction C₇H₁₅COOH(aq)+ HCOO^-(aq) $\rarr$ C₇H₁₅COO^-(aq)+ HCOOH(aq) Is 7.23 * 10^-2 at 25°C. If K_a for formic acid (HCOOH)is 1.77 * 10^-4, what is the acid dissociation constant for C₇H₁₅COOH?

A 0.14 M HNO₂ solution is 5.7% ionized. Calculate the H⁺ ion concentration.

Al(OH)₃ is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with KOH.

In aqueous solutions at 25°C, the sum of the ion concentrations ([H⁺] + [OH^-])equals 1 * 10^{- 14}.

Predict the direction in which the equilibrium will lie for the reaction H₃PO₄ + NO₃^- $\rarr$ H₂PO₄^- + HNO₃ K_a(H₃PO₄)= 7.5 * 10^-3

Identify the conjugate base of HCO₃^- in the reaction CO₃^2- + HSO₄^- $\rarr$ HCO₃^- + SO₄^2-

In the reaction HNO₃ + NH₃ $\rarr$ NH₄⁺ + NO₃^-, NH₄⁺ and NH₃ are a conjugate acid-base pair.

What is the concentration of H⁺ in a 2.5 M HCl solution?