Gce Model Questions Vol1 2022 Chemistry Question 47

Practice objective / multiple choice question 47 from the 2022 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 47 GCE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

A buffer solution is prepared by mixing \(0.250\ \text{mol}\) of acetic acid (\(K_a = 1.8\times10^{-5}\)) with \(0.150\ \text{mol}\) of sodium acetate in \(1.00\ \text{L}\) of water. (a) Calculate the initial pH of the solution. (b) After adding \(0.050\ \text{mol}\) of hydrochloric acid, what is the new pH? (c) How many moles of sodium hydroxide must be added to restore the pH to its original value?

Answer Options

A. a) pH = 4.55; b) pH = 4.30; c) 0.060 mol NaOH
Correct Answer B. a) pH = 4.52; b) pH = 4.27; c) 0.050 mol NaOH
C. a) pH = 4.60; b) pH = 4.35; c) 0.045 mol NaOH
D. a) pH = 4.48; b) pH = 4.20; c) 0.055 mol NaOH
Correct Answer
B
Correct Option:
a) pH = 4.52; b) pH = 4.27; c) 0.050 mol NaOH

About This Question

This is Gce Model Questions Vol1 2022 Chemistry Question 47. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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