Equilibrium Question 839
Question: How many gms of $ CaC_2O_4 $ will dissolve in one litre of saturated solution. $ K _{sp} $ of $ CaC_2O_4 $ is $ 2.5\times {10^{-19}},mol^{2}li{t^{-2}} $
Options:
A) 0.0064 g
B) 0.0128 g
C) 0.0032 g
D) None of these
Show Answer
Answer:
Correct Answer: A
Solution:
$ CaC_2O_4\rightarrow \overset{2+}{\mathop{Ca}},+C_2O_4^{2-};K _{sp}=S^{2} $
$ \therefore S=\sqrt{K _{sp}}=\sqrt{2.5\times {10^{-9}}}=5\times {10^{-5}}mol/litre $ solubility $ =5\times {10^{-5}}\times 128=0.0064g $
