Waec Model Questions Vol1 2018 Chemistry Question 9

Practice objective / multiple choice question 9 from the 2018 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Medium Difficulty
Question 9 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • 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. (a) Calculate the initial pH of the buffer. (b) After adding 0.050 mol of HCl to the solution (volume change negligible), what is the new pH? Give both pH values to two decimal places.

Answer Options

A. Initial pH = 4.68; Final pH = 4.41
Correct Answer B. Initial pH = 4.52; Final pH = 4.27
C. Initial pH = 4.30; Final pH = 4.27
D. Initial pH = 4.52; Final pH = 4.10
Correct Answer
B
Correct Option:
Initial pH = 4.52; Final pH = 4.27

About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 9. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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