Igcse Model Questions Vol1 2018 Chemistry Question 39

Practice objective / multiple choice question 39 from the 2018 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Hard Difficulty
Question 39 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

A sample containing \(0.0250\ \text{mol}\) of acetic acid (\(\text{CH}_3\text{COOH}\)) is dissolved in \(500\ \text{mL}\) of water. The acid dissociation constant is \(K_a = 1.8\times10^{-5}\).\n(a) Calculate the pH of the solution.\n(b) The solution is titrated with \(0.100\ \text{M}\) NaOH. What volume of NaOH is required to reach the equivalence point?\n(c) What is the pH at the half‑equivalence point?

Answer Options

Correct Answer A. pH = 3.02; volume NaOH = 250 mL; pH at half‑equivalence = 4.74
B. pH = 2.70; volume NaOH = 225 mL; pH at half‑equivalence = 4.20
C. pH = 3.30; volume NaOH = 260 mL; pH at half‑equivalence = 5.00
D. pH = 2.85; volume NaOH = 200 mL; pH at half‑equivalence = 4.50
Correct Answer
A
Correct Option:
pH = 3.02; volume NaOH = 250 mL; pH at half‑equivalence = 4.74

About This Question

This is Igcse Model Questions Vol1 2018 Chemistry Question 39. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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