Neco 2023 Chemistry Question 35

Practice objective / multiple choice question 35 from the 2023 Neco Chemistry examination.

Neco 2023 Chemistry Objective / Multiple Choice Medium Difficulty
Question 35 NECO • 2023 • CHEMISTRY • objective

A buffer solution contains 0.20 mol of acetic acid (CH₃COOH) and 0.30 mol of sodium acetate (CH₃COONa) in 1.0 L of water. The acid dissociation constant of acetic acid is \(K_{a}=1.8\times10^{-5}\).\n\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.\n(c) How many moles of NaOH must be added to restore the pH to its original value?

Answer Options

A. a) pH = 4.95; b) pH = 4.70; c) 0.07 mol NaOH
Correct Answer B. a) pH = 4.92; b) pH = 4.74; c) 0.05 mol NaOH
C. a) pH = 5.12; b) pH = 4.94; c) 0.04 mol NaOH
D. a) pH = 4.80; b) pH = 4.60; c) 0.06 mol NaOH
Correct Answer
B
Correct Option:
a) pH = 4.92; b) pH = 4.74; c) 0.05 mol NaOH

About This Question

This is Neco 2023 Chemistry Question 35. It is one of the objective questions from the 2023 Neco Chemistry examination.

Difficulty level: Medium .

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