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 $



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