Question 1

Which of the following acids has the lowest pH? 0.1 M HBO, pKa = 2.43
0)1 M HA, pKa = 4.55
0)1 M HMO, pKa = 8.23
0)1 M HST, pKa = 11.89
Pure water

Accepted Answer

A)  HA 
B)  HST 
C)  HMO 
D)  HBO 
E)  pure water 
A)  HA 
B)  HST 
C)  HMO 
D)  HBO 
E)  pure water

Question 2

The substance HOBr is considered

Accepted Answer

A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound. 
A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound.

Question 3

An aqueous solution is considered to be acidic if

Accepted Answer

A)  the hydroxide ion concentration is 10-6 M. 
B)  the hydrogen ion concentration is 10-8 M. 
C)  the hydroxide and hydrogen ion concentrations are equal. 
D)  the hydroxide ion concentration is greater than the hydrogen ion concentration. 
E)  the hydroxide ion concentration is 10-10 M. 
A)  the hydroxide ion concentration is 10-6 M. 
B)  the hydrogen ion concentration is 10-8 M. 
C)  the hydroxide and hydrogen ion concentrations are equal. 
D)  the hydroxide ion concentration is greater than the hydrogen ion concentration. 
E)  the hydroxide ion concentration is 10-10 M.

Question 4

Select the strongest acid from the following list.

Accepted Answer

A)  HBrO4 
B)  HClO 
C)  HBrO2 
D)  HBrO 
E)  HIO 
A)  HBrO4 
B)  HClO 
C)  HBrO2 
D)  HBrO 
E)  HIO

Question 5

Select the pair of substances that is not a conjugate acid-base pair.

Accepted Answer

A)  H3O+, H2O 
B)  HNO2, NO2- 
C)  H2SO4, HSO4- 
D)  H2S, S2- 
E)  NH3, NH2- 
A)  H3O+, H2O 
B)  HNO2, NO2- 
C)  H2SO4, HSO4- 
D)  H2S, S2- 
E)  NH3, NH2-

Question 6

Which of the following pairs has the stronger acid listed first?

Accepted Answer

A)  HBr, HI 
B)  HClO2, HClO3 
C)  H2SeO4, H2SeO3 
D)  HNO2, HNO3 
E)  HF, HCl 
A)  HBr, HI 
B)  HClO2, HClO3 
C)  H2SeO4, H2SeO3 
D)  HNO2, HNO3 
E)  HF, HCl

Question 7

Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

Accepted Answer

A)  Fe3+ 
B)  H3O+ 
C)  HSO4- 
D)  NH3 
E)  H2O 
A)  Fe3+ 
B)  H3O+ 
C)  HSO4- 
D)  NH3 
E)  H2O

Question 8

The substance H2SO3 is considered

Accepted Answer

A)  a weak Arrhenius base. 
B)  a strong Arrhenius acid. 
C)  a strong Arrhenius base. 
D)  a neutral compound. 
E)  a weak Arrhenius acid. 
A)  a weak Arrhenius base. 
B)  a strong Arrhenius acid. 
C)  a strong Arrhenius base. 
D)  a neutral compound. 
E)  a weak Arrhenius acid.

Question 9

Which one of the following substances will give an aqueous solution of pH closest to 7?

Accepted Answer

A)  KNO3 
B)  CO2 
C)  NH4I 
D)  NH3 
E)  CH3NH2 
A)  KNO3 
B)  CO2 
C)  NH4I 
D)  NH3 
E)  CH3NH2

Question 10

A student adds 0.1 mol of oxalic acid and 0.1 mol of sodium dihydrogen phosphate to enough water to make 1.0 L of solution. The following equilibrium is established with the concentrations of the products greater than the concentrations of the reactants. Which of the statements about the equilibrium system is correct? H2C2O4(aq) + H2PO4(aq)   HC2O4(aq) + H3PO4(aq)

Accepted Answer

A)  Oxalic acid is a weaker acid than phosphoric acid. 
B)  The hydrogen oxalate anion, HC2O4, is a stronger base than the dihydrogen phosphate anion, H2PO4. 
C)  Phosphoric acid is a weaker acid than oxalic acid. 
D)  The dihydrogen phosphate anion, H2PO4-, is a stronger acid than oxalic acid. 
E)  Water is a stronger acid than either oxalic or phosphoric acids. 
A)  Oxalic acid is a weaker acid than phosphoric acid. 
B)  The hydrogen oxalate anion, HC2O4, is a stronger base than the dihydrogen phosphate anion, H2PO4. 
C)  Phosphoric acid is a weaker acid than oxalic acid. 
D)  The dihydrogen phosphate anion, H2PO4-, is a stronger acid than oxalic acid. 
E)  Water is a stronger acid than either oxalic or phosphoric acids.

Question 11

What is the value of Ka for the methylammonium ion, CH3NH3+? Kb(CH3NH2) = 4.4 × 10-4

Accepted Answer

A)  4.4 × 10-4 
B)  4.8 × 10-6 
C)  4.4 × 10-10 
D)  2.3 × 10-11 
E)  4.4 × 10-18 
A)  4.4 × 10-4 
B)  4.8 × 10-6 
C)  4.4 × 10-10 
D)  2.3 × 10-11 
E)  4.4 × 10-18

Question 12

All Lewis acids contain at least one proton.

Accepted Answer

A) True 
 B)False

Question 13

In order to be a Brønsted-Lowry base, a species must contain a proton.

Accepted Answer

A) True 
 B)False

Question 14

The hydrated Al3+ ion, Al(H2O)63+, is a weak acid in water. What are the products of its reaction with H2O? Al(H2O)63+(aq) + H2O(l) → ?

Accepted Answer

A)  Al(H2O)5OH2+(aq) + H3O+(aq) 
B)  Al(H2O)6H4+(aq) + OH-(aq) 
C)  Al(H2O)53+(aq) + 2H2O(l) 
D)  Al(H2O)6OH2+(aq) + H3O+(aq) 
E)  Al(H2O)62+(aq) + H3O+(aq) 
A)  Al(H2O)5OH2+(aq) + H3O+(aq) 
B)  Al(H2O)6H4+(aq) + OH-(aq) 
C)  Al(H2O)53+(aq) + 2H2O(l) 
D)  Al(H2O)6OH2+(aq) + H3O+(aq) 
E)  Al(H2O)62+(aq) + H3O+(aq)

Question 15

According to Brønsted and Lowry, which one of the following is not a conjugate acid-base pair?

Accepted Answer

A)  H3O+/OH- 
B)  CH3OH2+/CH3OH 
C)  HI/I- 
D)  HSO4-/SO42- 
E)  H2/H- 
A)  H3O+/OH- 
B)  CH3OH2+/CH3OH 
C)  HI/I- 
D)  HSO4-/SO42- 
E)  H2/H-

Question 16

Which one of the following is a strong acid?

Accepted Answer

A)  H2CO3 
B)  H2SO3 
C)  H2SO4 
D)  H3PO4 
E)  CH3COOH 
A)  H2CO3 
B)  H2SO3 
C)  H2SO4 
D)  H3PO4 
E)  CH3COOH

Question 17

Iodine trichloride, ICl3, will react with a chloride ion to form ICl4-. Which species, if any, acts as a Lewis acid this reaction?

Accepted Answer

A)  ICl4- 
B)  ICl3 
C)  Cl- 
D)  the solvent 
E)  None of these choices are correct. 
A)  ICl4- 
B)  ICl3 
C)  Cl- 
D)  the solvent 
E)  None of these choices are correct.

Question 18

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO3)3, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

A)  The solution is basic. 
B)  The solution is neutral. 
C)  The solution is acidic. 
D)  The value of Ka for the species in solution must be known before a prediction can be made. 
E)  The value of Kb for the species in solution must be known before a prediction can be made. 
A)  The solution is basic. 
B)  The solution is neutral. 
C)  The solution is acidic. 
D)  The value of Ka for the species in solution must be known before a prediction can be made. 
E)  The value of Kb for the species in solution must be known before a prediction can be made.

Question 19

The substance HClO4 is considered

Accepted Answer

A)  a weak acid. 
B)  a weak base. 
C)  a strong acid. 
D)  a strong base. 
E)  a neutral compound. 
A)  a weak acid. 
B)  a weak base. 
C)  a strong acid. 
D)  a strong base. 
E)  a neutral compound.

Question 20

The substance HCl is considered

Accepted Answer

A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound. 
A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound.

Exam 18: Acid-Base Equilibria

Which of the following acids has the lowest pH? 0.1 M HBO, pKa = 2.43 0)1 M HA, pKa = 4.55 0)1 M HMO, pKa = 8.23 0)1 M HST, pKa = 11.89 Pure water

The substance HOBr is considered

An aqueous solution is considered to be acidic if

Select the strongest acid from the following list.

Select the pair of substances that is not a conjugate acid-base pair.

Which of the following pairs has the stronger acid listed first?

Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

The substance H2SO3 is considered

Which one of the following substances will give an aqueous solution of pH closest to 7?

What is the value of Ka for the methylammonium ion, CH3NH3+? Kb(CH3NH2) = 4.4 × 10-4

All Lewis acids contain at least one proton.

In order to be a Brønsted-Lowry base, a species must contain a proton.

The hydrated Al3+ ion, Al(H2O)63+, is a weak acid in water. What are the products of its reaction with H2O? Al(H2O)63+(aq) + H2O(l) → ?

According to Brønsted and Lowry, which one of the following is not a conjugate acid-base pair?

Which one of the following is a strong acid?

Iodine trichloride, ICl3, will react with a chloride ion to form ICl4-. Which species, if any, acts as a Lewis acid this reaction?

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO3)3, to 1.00 L of water. Which statement about the solution is correct?

The substance HClO4 is considered

The substance HCl is considered

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

The Properties of Mixtures Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Which of the following acids has the lowest pH? 0.1 M HBO, pK_a = 2.43 0)1 M HA, pK_a = 4.55 0)1 M HMO, pK_a = 8.23 0)1 M HST, pK_a = 11.89 Pure water

The substance H₂SO₃ is considered

What is the value of K_a for the methylammonium ion, CH₃NH₃⁺? K_b(CH₃NH₂) = 4.4 × 10^-4

The hydrated Al³⁺ ion, Al(H₂O)₆³⁺, is a weak acid in water. What are the products of its reaction with H₂O? Al(H₂O)₆³⁺(aq) + H₂O(l) → ?

Iodine trichloride, ICl₃, will react with a chloride ion to form ICl₄^-. Which species, if any, acts as a Lewis acid this reaction?

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO₃)₃, to 1.00 L of water. Which statement about the solution is correct?

The substance HClO₄ is considered