Neco 2017 Chemistry Question 39

Practice objective / multiple choice question 39 from the 2017 Neco Chemistry examination.

Neco 2017 Chemistry Objective / Multiple Choice Medium Difficulty
Question 39 NECO • 2017 • CHEMISTRY • objective

For the sparingly soluble salt AB₂(s) \(\rightleftharpoons\) A^{2+} + 2B⁻, \(K_{sp}=1.44\times10^{-6}\) at 25 °C. Its molar solubility in pure water is \(s_{0}\). When 0.10 M of the common ion B⁻ is added, calculate the new molar solubility \(s\) and the percent decrease relative to \(s_{0}\).

Answer Options

A. s = 2.88×10^{-4} M; percent decrease ≈ 96 %
B. s = 7.2×10^{-4} M; percent decrease ≈ 90 %
Correct Answer C. s = 1.44×10^{-4} M; percent decrease ≈ 98 %
D. s = 1.44×10^{-5} M; percent decrease ≈ 99.8 %
Correct Answer
C
Correct Option:
s = 1.44×10^{-4} M; percent decrease ≈ 98 %

About This Question

This is Neco 2017 Chemistry Question 39. It is one of the objective questions from the 2017 Neco Chemistry examination.

Difficulty level: Medium .

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