Acids & Bases

Predict the conjugate acid of HCO₂⁻.

• CO₂²⁻

• HCO₂H₂⁺

• HCO₂

• HCO₂H

Predict the conjugate base of CH₃C(O)CH₃.

• CH₃C(O)CH₂⁺

• CH₃C(O)CH₂

• CH₃C(O)CH₂⁻

• CH₃C(O)CH₄⁻

Which of the following is a conjugate acid-base pair?

• A) H₃AsO₄, AsO₄³⁻

• B) H₂AsO₄⁻, HAsO₄²⁻

• C) H₂AsO₄⁻, AsO₄³⁻

• D) H₃AsO₄, HAsO₄²⁻

Consider the reaction below. Which species are the Brønsted-Lowry acids? HCN(aq) + CH₃NH₂(aq) ⇌ CH₃NH₃⁺(aq) + CN⁻(aq)

• A) CN⁻, CH₃NH₃⁺

• B) HCN, CH₃NH₂

• C) CH₃NH₂, CH₃NH₃⁺

• D) HCN, CH₃NH₃⁺

Consider the table of weak acids below. Which of the following bases would be the strongest weak base?

• A) CN⁻

• B) HO₂⁻

• C) IO⁻

• D) BrO⁻

Which one of the following correctly shows the weak acid equilibrium for hypobromous acid, HBrO?

A) HBrO(aq) + H₂O(l) ⇌ BrO⁻(aq) + H₃O⁺(aq)

B) HBrO(aq) ⇌ Br⁺(aq) + OH⁻(aq)

C) HBrO(aq) + H₂O(l) ⇌ H₂BrO₂⁻(aq) + H⁺(aq)

D) HBrO(aq) + H₂O(l) ⇌ H₂BrO⁺(aq) + OH⁻(aq)

• A

• B

• C

• D

Calculate the [H₃O⁺] of a milk of magnesia solution that contains [OH⁻] = 4.49 × 10⁻⁵ M.

Answer explanation

2.23 × 10⁻¹⁰ M

A solution has a pOH of 13.12. This tells us

A) the solution is very acidic.

B) the solution is only slightly acidic.

C) the solution is only slightly basic.

D) the solution is very basic.

• A) the solution is very acidic.

• B) the solution is only slightly acidic.

• C) the solution is only slightly basic.

• D) the solution is very basic.

The pH of an acidic solution is 5.41. What is [H⁺]?

Answer explanation

Correct answer:

3.9 × 10⁻⁶ M

Which one of the following represents the molecular equation for the reaction of HNO₃ with CsOH?

A) CsOH (aq) + HNO₃ (aq) → H₂O (l) + CsNO₃ (aq)

B) Cs⁺ (aq) + NO₃⁻ (aq) → CsNO₃ (s)

C) H⁺ (aq) + OH⁻ (aq) → H₂O (l)

D) CsOH (aq) + HNO₃ (aq) → H₂O (aq) + CsNO₃ (s)

• A

• B

• C

• D