Waec Model Questions Vol1 2021 Chemistry Question 22

Practice objective / multiple choice question 22 from the 2021 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 22 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A saturated solution of AgCl at 25 °C has a solubility of 1.3×10⁻⁵ M. When NaCl is added to give a final chloride concentration of 0.010 M, the solubility of AgCl decreases. (a) Calculate the new solubility of Ag⁺ under these conditions. (b) The solubility product of AgCl at 35 °C is twice that at 25 °C. Assuming the Ksp doubles for every 10 °C increase, estimate the temperature (to the nearest degree Celsius) at which the solution containing 0.010 M Cl⁻ would become unsaturated (i.e., [Ag⁺] < 1.0×10⁻⁶ M).

Answer Options

A. a) 2.6×10⁻⁸ M; b) ≈ 78 °C
B. a) 3.4×10⁻⁸ M; b) ≈ 70 °C
Correct Answer C. a) 1.69×10⁻⁸ M; b) ≈ 84 °C
D. a) 1.0×10⁻⁸ M; b) ≈ 90 °C
Correct Answer
C
Correct Option:
a) 1.69×10⁻⁸ M; b) ≈ 84 °C

About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 22. It is a objective / multiple choice question from the 2021 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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