Waec Model Questions Vol1 2021 Chemistry Question 15

Practice objective / multiple choice question 15 from the 2021 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 15 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A buffer solution is prepared by dissolving 0.20 mol of acetic acid (CH₃COOH, Ka = 1.8×10⁻⁵) and 0.15 mol of sodium acetate (CH₃COONa) in 1.00 L of water. (a) Calculate the pH of the buffer. (b) If 0.05 mol of HCl is added to the solution, what is the new pH? (Assume the volume change is negligible.)

Answer Options

A. Initial pH = 4.58; after adding 0.05 mol HCl, pH = 4.30
B. Initial pH = 4.50; after adding 0.05 mol HCl, pH = 4.20
C. Initial pH = 4.74; after adding 0.05 mol HCl, pH = 4.55
Correct Answer D. Initial pH = 4.62; after adding 0.05 mol HCl, pH = 4.34
Correct Answer
D
Correct Option:
Initial pH = 4.62; after adding 0.05 mol HCl, pH = 4.34

About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 15. It is a objective / multiple choice question from the 2021 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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