Equilibrium Question 820
Question: What is the minimum concentration of $ SO_4^{2-} $ required to precipitate $ BaSO_4 $ in a solution containing $ 1.0\times {10^{-4}} $ mole of $ B{a^{2+}} $ - $ K _{sp} $ for $ BaSO_4=4\times {10^{-10}} $
Options:
A) $ 4\times {10^{-10}}M $
B) $ 2\times {10^{-7}}M $
C) $ 4\times {10^{-6}}M $
D) $ 2\times {10^{-3}}M $
Show Answer
Answer:
Correct Answer: C
Solution:
$ [B{a^{2+}}][SO_4^{2-}] $
$ K _{sp}=(1.0\times {10^{-4}})[SO_4^{2-}]=4\times {10^{-10}} $
$ \therefore [SO_4^{2-}]=4\times {10^{-6}}M $
