Gce Model Questions Vol1 2020 Chemistry Question 24

Practice objective / multiple choice question 24 from the 2020 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 24 GCE_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • objective

A buffer solution is prepared by dissolving 0.20 mol of acetic acid (\(\mathrm{CH_{3}COOH}\), \(K_{a}=1.8\times10^{-5}\)) and 0.15 mol of sodium acetate (\(\mathrm{CH_{3}COONa}\)) in enough water to make 1.00 L of solution.\n(a) Calculate the initial pH of the buffer.\n(b) After adding 0.05 mol of HCl to the solution, calculate the new pH.

Answer Options

A. Initial pH ≈ 4.74; after HCl addition pH ≈ 4.50
B. Initial pH ≈ 4.30; after HCl addition pH ≈ 4.10
Correct Answer C. Initial pH ≈ 4.62; after HCl addition pH ≈ 4.35
D. Initial pH ≈ 4.55; after HCl addition pH ≈ 4.20
Correct Answer
C
Correct Option:
Initial pH ≈ 4.62; after HCl addition pH ≈ 4.35

About This Question

This is Gce Model Questions Vol1 2020 Chemistry Question 24. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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