This sparingly soluble salts AB and XY2 have the same solubility product. Which salt will be more soluble? Explain.

Monjur Alahi

This sparingly soluble salts AB and XY2 have the same solubility product. Which salt will be more soluble? Explain.


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Salim Ahmed Kawsar

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Suppose solubility of AB =a mol L-1 . Then AB ------> A+ + B- , Ksp= [A+ ] [B--] = a*a =a2 

Therefore a= under root Ksp 

Suppose solubility of salt XY2 = b mol L-1 . Then 

XY2------> X2+ 2 Y- ,K sp =[X2+] [Y- ] 2 = b (2b)2 i,e., 4b3 = Ksp or b= (Ksp/4) 1/3 

Obviously b>a (as Ksp have values with negative powers of 10). Hense, salt XY2 is more soluble.

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