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How many gram of `CaC_(2)O_(4)` will dissolve in distilled water to make one litre of saturated solution ? `(K_(sp) =2.5xx10^(-9)` and its molecular mass is 128 )A. 0.0064 gB. 0.0128 gC. 0.0032 gD. 0.0640 g |
Answer» Correct Answer - A `CaC_(2)O_(4) hArr Ca^(2+)+C_(2)O_(4)^(2-)` `K_(sp)=[Ca^(+2)][C_(2)O_(4)^(-2)]` `K_(sp)=s^(2)` `s=sqrt(K_(sp))=sqrt(2.5 xx 10^(-9))` `=5 xx 10^(-5) mol L^(-1)` Solubility of `g L^(-1) =5 xx 10^(-5) xx ` mol. wt. `=5 xx 10^(-5) xx 128 =0.00640 g L^(-1)` |
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