Which of the following represents the reaction when a weak base, B, is dissolved in water?

• A. B (aq) + H3O+ (aq) → HB+ (aq) + H2O (l)
• B. B (aq) + H2O (l) ⇌ B- (aq) + H3O+ (aq)
• C. B (aq) + H2O (l) ⇌ HB+ (aq) + OH- (aq)
• D. B (aq) + H3O+ (l) → HB+ (aq) + H2O (l)

Answer: (C)

Verified step by step guidance

1. Identify the nature of the species involved: A weak base (B) is a substance that can accept a proton (H+). When dissolved in water, it partially ionizes to form its conjugate acid (HB+) and hydroxide ions (OH-).
2. Understand the role of water: In the reaction of a weak base with water, water acts as an acid, donating a proton to the base. This results in the formation of the conjugate acid of the base and hydroxide ions.
3. Write the general equation for a weak base reacting with water: The general reaction for a weak base (B) in water is B (aq) + H2O (l) ⇌ HB+ (aq) + OH- (aq). This shows the base accepting a proton from water, forming its conjugate acid and hydroxide ions.
4. Analyze the given options: Compare the given reactions with the general equation. The correct representation should show the weak base reacting with water to form its conjugate acid and hydroxide ions.
5. Select the correct reaction: The correct reaction is B (aq) + H2O (l) ⇌ HB+ (aq) + OH- (aq), as it accurately represents the weak base accepting a proton from water, forming its conjugate acid and hydroxide ions.