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 one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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