Neco Model Questions Vol1 2025 Chemistry Question 23

Practice objective / multiple choice question 23 from the 2025 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Medium Difficulty
Question 23 NECO_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A buffer solution is prepared by mixing 0.250 mol of acetic acid (\(\text{CH}_3\text{COOH}\), \(K_a = 1.8 \times 10^{-5}\)) with 0.150 mol of sodium acetate (\(\text{CH}_3\text{COONa}\)) in 1.00 L of water. (a) Calculate the initial pH of the buffer. (b) After adding 0.050 mol of hydrochloric acid (HCl) to the solution, calculate the new pH.

Answer Options

Correct Answer A. Initial pH ≈ 4.52; pH after HCl addition ≈ 4.27
B. Initial pH ≈ 5.00; pH after HCl addition ≈ 4.80
C. Initial pH ≈ 4.30; pH after HCl addition ≈ 4.10
D. Initial pH ≈ 4.75; pH after HCl addition ≈ 4.50
Correct Answer
A
Correct Option:
Initial pH ≈ 4.52; pH after HCl addition ≈ 4.27

About This Question

This is Neco Model Questions Vol1 2025 Chemistry Question 23. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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