Neco 2023 Chemistry Question 40

Practice objective / multiple choice question 40 from the 2023 Neco Chemistry examination.

Neco 2023 Chemistry Objective / Multiple Choice Hard Difficulty
Question 40 NECO • 2023 • CHEMISTRY • objective
Neco 2023 Chemistry Question 40 diagram

Benzoic acid (\(\mathrm{C_6H_5COOH}\)) has a dissociation constant \(K_a = 6.3 \times 10^{-5}\) at 25 °C. (i) Calculate the pH of a 0.10 M solution of benzoic acid. (ii) After preparing 250 mL of this solution, 0.005 mol of NaOH is added. Assuming complete neutralisation of an equivalent amount of benzoic acid, calculate the pH of the resulting solution.

Answer Options

A. Initial pH ≈ 2.80; after addition of NaOH, pH ≈ 3.80
B. Initial pH ≈ 2.30; after addition of NaOH, pH ≈ 3.30
C. Initial pH ≈ 2.60; after addition of NaOH, pH ≈ 4.00
Correct Answer D. Initial pH ≈ 2.60; after addition of NaOH, pH ≈ 3.60
Correct Answer
D
Correct Option:
Initial pH ≈ 2.60; after addition of NaOH, pH ≈ 3.60

About This Question

This is Neco 2023 Chemistry Question 40. It is one of the objective questions from the 2023 Neco Chemistry examination.

Difficulty level: Hard .

View More Neco 2023 Chemistry Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support