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Two sparingly soluble salts AB and XYZ h...

Two sparingly soluble salts AB and XYZ have the same soubility product. Which salt will be more soluble?

Text Solution

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Suppose solubility of `AB = a "mol " L^(-1) `. Then `AB hArr A^(+) + B^(-) , K_(sp)= [A^(+)][B^(-)]=axxa=a^(2)`
`:.a=sqrt(K_(sp))`
Suppose solubility of salt `XY_(2) = b "mol" L^(-1)`. Then
`XY_(2) hArr X^(2)+2, Y^(-), K_(sp)=[X^(2+)][Y^(-)]^(2)=b(2b)^(2) i.e., 4b^(3)=K_(sp) or b= (K_(sp)//4)^(1//3)`
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