Gce Model Questions Vol1 2021 Chemistry Question 24

Practice objective / multiple choice question 24 from the 2021 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 24 GCE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A buffer is prepared by dissolving 0.250 mol of acetic acid (\(\ce{CH3COOH}\), \(K_a = 1.8\times10^{-5}\)) and 0.150 mol of sodium acetate (\(\ce{CH3COONa}\)) in 1.00 L of water. (a) Calculate the initial pH. (b) After adding 0.050 mol of \(\ce{HCl}\) (volume change negligible), calculate the new pH.

Answer Options

Correct Answer A. Initial pH ≈ 4.52; after adding HCl pH ≈ 4.27
B. Initial pH ≈ 4.68; after adding HCl pH ≈ 4.45
C. Initial pH ≈ 4.60; after adding HCl pH ≈ 4.35
D. Initial pH ≈ 4.30; after adding HCl pH ≈ 4.10
Correct Answer
A
Correct Option:
Initial pH ≈ 4.52; after adding HCl pH ≈ 4.27

About This Question

This is Gce Model Questions Vol1 2021 Chemistry Question 24. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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