Neco Model Questions Vol1 2018 Chemistry Question 25

Practice objective / multiple choice question 25 from the 2018 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Medium Difficulty
Question 25 NECO_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

A buffer solution is prepared by dissolving 0.250 mol of acetic acid (\(K_a = 1.8\times10^{-5}\)) and 0.150 mol of sodium acetate in 1.00 L of water.\n(a) Calculate the pH of the buffer.\n(b) After the buffer is prepared, 0.050 mol of HCl is added (volume remains 1.00 L). Calculate the new pH of the solution.

Answer Options

Correct Answer A. (a) pH ≈ 4.52. (b) After adding 0.050 mol HCl, pH ≈ 4.27.
B. (a) pH ≈ 4.35. (b) After adding 0.050 mol HCl, pH ≈ 4.05.
C. (a) pH ≈ 4.45. (b) After adding 0.050 mol HCl, pH ≈ 4.20.
D. (a) pH ≈ 4.60. (b) After adding 0.050 mol HCl, pH ≈ 4.12.
Correct Answer
A
Correct Option:
(a) pH ≈ 4.52. (b) After adding 0.050 mol HCl, pH ≈ 4.27.

About This Question

This is Neco Model Questions Vol1 2018 Chemistry Question 25. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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