Neco 2020 Chemistry Question 23

Practice objective / multiple choice question 23 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 23 NECO • 2020 • CHEMISTRY • objective

A buffer solution is prepared by dissolving 0.250 mol of acetic acid (\( \mathrm{CH_3COOH} \), \( K_a = 1.8\times10^{-5} \)) and 0.150 mol of sodium acetate (\( \mathrm{CH_3COONa} \)) in 1.00 L of water. (a) Calculate the pH of the buffer. (b) Then 0.050 mol of \( \mathrm{HCl} \) is added to the solution. Calculate the new pH after the acid is added.

Answer Options

A. Initial pH = 4.70; after addition = 4.40
Correct Answer B. Initial pH = 4.52; after addition = 4.27
C. Initial pH = 4.45; after addition = 4.20
D. Initial pH = 4.60; after addition = 4.35
Correct Answer
B
Correct Option:
Initial pH = 4.52; after addition = 4.27

About This Question

This is Neco 2020 Chemistry Question 23. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Medium .

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