Equilibrium Question 304

Question: The solubility product of $ As_2S_3 $ is $ 2.8\times {10^{-72}} $ . What is the solubility of $ As_2S_3 $ [Pb. CET 2003]

Options:

A) $ 1.09\times {10^{-15}}\ mole/litre $

B) $ 1.72\times {10^{-15}}\ mole/litre $

C) $ 2.3\times {10^{-16}}\ mole/litre $

D) $ 1.65\times {10^{-36}}\ mole/litre $

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Answer:

Correct Answer: A

Solution:

$ K _{sp}=[A{s^{3+}}][{S^{2-}}] $ , $ S=\sqrt[5]{\frac{K _{sp}}{108}} $

$ =\sqrt[5]{\frac{2.8\times {10^{-72}}}{108}} $

$ =1.09\times {10^{-15}} $



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