Question 1

Calculate the pH of a 6.71 * 10-2 M NaOH solution.

Accepted Answer

A) 12.83 
B) 2.17 
C) 11.82 
D) 6.71 
E) 1.17 
A) 12.83 
B) 2.17 
C) 11.82 
D) 6.71 
E) 1.17

Question 2

Write the chemical formula for sulfuric acid.

Accepted Answer

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

Question 3

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

Accepted Answer

A) NaCl 
B) KNO2 
C) NaCN 
D) NH4NO3 
E) FeCl3 
A) NaCl 
B) KNO2 
C) NaCN 
D) NH4NO3 
E) FeCl3

Question 4

Identify the conjugate base of HSO4 - in the reaction H2PO4- + HSO4-   H3PO4 + SO42-

Accepted Answer

A) H2PO4- 
B) H2SO4 
C) H2O 
D) H3PO4 
E) SO42- 
A) H2PO4- 
B) H2SO4 
C) H2O 
D) H3PO4 
E) SO42-

Question 5

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 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

Calculate the pH of 2.6 * 10-2 M KOH.

Accepted Answer

A) 12.41 
B) 15.59 
C) 2.06 
D) 7.00 
E) 1.59 
A) 12.41 
B) 15.59 
C) 2.06 
D) 7.00 
E) 1.59

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

The pH of a 0.02 M solution of an unknown weak base is 8.1.What is the pKb of the unknown base?

Accepted Answer

Question 10

Which of the following yields a basic solution when dissolved in water?

Accepted Answer

A) NO2 
B) P4O10 
C) K2O 
D) NaCl 
E) SO2 
A) NO2 
B) P4O10 
C) K2O 
D) NaCl 
E) SO2

Question 11

What is the OH- ion concentration in a 5.2 * 10-4 M HNO3 solution?

Accepted Answer

A) 1.9 * 10-11 M 
B) 1.0 * 10-7 M 
C) 5.2 * 10-4 M 
D) zero 
E) 1.0 * 10-4 M 
A) 1.9 * 10-11 M 
B) 1.0 * 10-7 M 
C) 5.2 * 10-4 M 
D) zero 
E) 1.0 * 10-4 M

Question 12

Aspartic acid (C4H7NO4), one of the 20 essential amino acids, has two ionizable hydrogens.At 25°C, Ka1 = 1.38 * 10-4 and Ka2 = 1.51 * 10-10. What is the concentration of doubly ionized aspartate ions in a 0.125 M aqueous solution of aspartic acid?

Accepted Answer

A) 3.33 * 10-2 M 
B) 4.16 * 10-3 M 
C) 4.15 * 10-3 M 
D) 1.51 * 10-10 M 
E) 2.08 * 10-14 M 
A) 3.33 * 10-2 M 
B) 4.16 * 10-3 M 
C) 4.15 * 10-3 M 
D) 1.51 * 10-10 M 
E) 2.08 * 10-14 M

Question 13

Of the two acids HBr and H2Se, H2Se is the stronger acid.

Accepted Answer

A) True 
 B)False

Question 14

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 15

Calculate the concentration of oxalate ion (C2O42-)in a 0.175 M solution of oxalic acid (C2H2O4).[For oxalic acid, Ka1 = 6.5 * 10-2, Ka2 = 6.1 * 10-5.]

Accepted Answer

A) 0.11 M 
B) 6.1 * 10-5 M 
C) 4.0 * 10-6 M 
D) 0.0791 M 
E) 0.175 M 
A) 0.11 M 
B) 6.1 * 10-5 M 
C) 4.0 * 10-6 M 
D) 0.0791 M 
E) 0.175 M

Question 16

Write the chemical formula for the acid formed when Cl2O7 is dissolved in water.

Accepted Answer

Question 17

Which one of the following salts will form an acidic solution on dissolving in water?

Accepted Answer

A) LiBr 
B) NaF 
C) KOH 
D) FeCl3 
E) NaCN 
A) LiBr 
B) NaF 
C) KOH 
D) FeCl3 
E) NaCN

Question 18

Will a 0.1 M solution of NH4NO2(aq)be acidic, basic, or neutral?

Accepted Answer

Question 19

What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [Ka(HF)= 7.1 * 10-4]

Accepted Answer

A) 1.47 
B) 1.90 
C) 1.30 
D) 1.63 
E) 2.82 
A) 1.47 
B) 1.90 
C) 1.30 
D) 1.63 
E) 2.82

Question 20

Al(OH)3 is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with HNO3.

Accepted Answer

Al(OH)₃ +

Exam 15: Acids and Bases

Calculate the pH of a 6.71 * 10-2 M NaOH solution.

Write the chemical formula for sulfuric acid.

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

Identify the conjugate base of HSO4 - in the reaction H2PO4- + HSO4- H3PO4 + SO42-

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.)

Calculate the pH of 2.6 * 10-2 M KOH.

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

The pH of a 0.02 M solution of an unknown weak base is 8.1.What is the pKb of the unknown base?

Which of the following yields a basic solution when dissolved in water?

What is the OH- ion concentration in a 5.2 * 10-4 M HNO3 solution?

Aspartic acid (C4H7NO4), one of the 20 essential amino acids, has two ionizable hydrogens.At 25°C, Ka1 = 1.38 * 10-4 and Ka2 = 1.51 * 10-10. What is the concentration of doubly ionized aspartate ions in a 0.125 M aqueous solution of aspartic acid?

Of the two acids HBr and H2Se, H2Se is the stronger acid.

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

Calculate the concentration of oxalate ion (C2O42-)in a 0.175 M solution of oxalic acid (C2H2O4).[For oxalic acid, Ka1 = 6.5 * 10-2, Ka2 = 6.1 * 10-5.]

Write the chemical formula for the acid formed when Cl2O7 is dissolved in water.

Which one of the following salts will form an acidic solution on dissolving in water?

Will a 0.1 M solution of NH4NO2(aq)be acidic, basic, or neutral?

What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [Ka(HF)= 7.1 * 10-4]

Al(OH)3 is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with HNO3.

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

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

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Calculate the pH of a 6.71 * 10^-2 M NaOH solution.

Identify the conjugate base of HSO₄^- in the reaction H₂PO₄^- + HSO₄^- H₃PO₄ + SO₄^2-

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.)

Calculate the pH of 2.6 * 10^-2 M KOH.

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

The pH of a 0.02 M solution of an unknown weak base is 8.1.What is the pK_b of the unknown base?

What is the OH^- ion concentration in a 5.2 * 10^-4 M HNO₃ solution?

Aspartic acid (C₄H₇NO₄), one of the 20 essential amino acids, has two ionizable hydrogens.At 25°C, K_a1 = 1.38 * 10^-4 and K_a2 = 1.51 * 10^-10. What is the concentration of doubly ionized aspartate ions in a 0.125 M aqueous solution of aspartic acid?

Of the two acids HBr and H₂Se, H₂Se is the stronger acid.

Calculate the concentration of oxalate ion (C₂O₄^2-)in a 0.175 M solution of oxalic acid (C₂H₂O₄).[For oxalic acid, K_a1 = 6.5 * 10^-2, K_a2 = 6.1 * 10^-5.]

Write the chemical formula for the acid formed when Cl₂O₇ is dissolved in water.

Will a 0.1 M solution of NH₄NO₂(aq)be acidic, basic, or neutral?

What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [K_a(HF)= 7.1 * 10^-4]

Al(OH)₃ is an amphoteric hydroxide. Write a balanced ionic equation to show its reaction with HNO₃.