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 $
Show Answer
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}} $
