Waec Model Questions Vol1 2025 Chemistry Question 49

Practice objective / multiple choice question 49 from the 2025 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Medium Difficulty
Question 49 WAEC_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A buffer solution is required to have pH 5.00 using acetic acid (Ka = 1.8×10⁻⁵) and sodium acetate. The total concentration of acid plus conjugate base must be 0.200 M and the final volume 250.0 mL. Calculate the masses of acetic acid (CH₃COOH, M = 60.05 g mol⁻¹) and sodium acetate trihydrate (CH₃COONa·3H₂O, M = 136.08 g mol⁻¹) needed.

Answer Options

Correct Answer A. Acetic acid: 1.07 g; Sodium acetate·3H₂O: 4.37 g
B. Acetic acid: 1.20 g; Sodium acetate·3H₂O: 3.90 g
C. Acetic acid: 0.95 g; Sodium acetate·3H₂O: 4.80 g
D. Acetic acid: 0.85 g; Sodium acetate·3H₂O: 5.10 g
Correct Answer
A
Correct Option:
Acetic acid: 1.07 g; Sodium acetate·3H₂O: 4.37 g

About This Question

This is Waec Model Questions Vol1 2025 Chemistry Question 49. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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