Waec Model Questions Vol1 2020 Chemistry Question 14

Practice objective / multiple choice question 14 from the 2020 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Medium Difficulty

Question 14 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A buffer is prepared by dissolving 0.250 mol of acetic acid (CH₃COOH, Ka = 1.8 × 10⁻⁵) and 0.150 mol of sodium acetate (CH₃COONa) in 1.00 L of water. Calculate the pH of the buffer after adding 0.050 mol of HCl, assuming the volume change is negligible.

Answer Options

A. 4.10

B. 4.55

Correct Answer C. 4.27

D. 3.85

Correct Answer

Correct Option:

4.27

About This Question

This is Waec Model Questions Vol1 2020 Chemistry Question 14. It is a objective / multiple choice question from the 2020 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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Waec Model Questions Vol1 2020 Chemistry Question 14

A buffer is prepared by dissolving 0.250 mol of acetic acid (CH₃COOH, Ka = 1.8 × 10⁻⁵) and 0.150 mol of sodium acetate (CH₃COONa) in 1.00 L of water. Calculate the pH of the buffer after adding 0.050 mol of HCl, assuming the volume change is negligible.

Answer Options

About This Question

Master the Exam!

A buffer is prepared by dissolving 0.250 mol of acetic acid (CH₃COOH, Ka = 1.8 × 10⁻⁵) and 0.150 mol of sodium acetate (CH₃COONa) in 1.00 L of water. Calculate the pH of the buffer after adding 0.050 mol of HCl, assuming the volume change is negligible.