Waec Model Questions Vol1 2025 Chemistry Question 46

Practice objective / multiple choice question 46 from the 2025 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Hard Difficulty
Question 46 WAEC_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A 0.100 M solution of a monoprotic carboxylic acid (HA) is titrated with 0.100 M NaOH. At the half‑equivalence point the pH is 4.75. (a) Determine the acid dissociation constant Ka of HA. (b) Calculate the pH of the solution at the equivalence point.

Answer Options

A. Ka = 1.78×10⁻⁵; pH at equivalence = 7.95
Correct Answer B. Ka = 1.78×10⁻⁵; pH at equivalence = 8.72
C. Ka = 2.34×10⁻⁵; pH at equivalence = 8.45
D. Ka = 1.78×10⁻⁴; pH at equivalence = 8.72
Correct Answer
B
Correct Option:
Ka = 1.78×10⁻⁵; pH at equivalence = 8.72

About This Question

This is Waec Model Questions Vol1 2025 Chemistry Question 46. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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