1.

Three sparingly soluble salts M_2 X, MX and MX_3 have the same solubility product. Their solubilities will be in the order

Answer»

`MX_3gt MX gt M_2X`
`MX_3gt M_2 XGT MX`
`MXgt MX_3 gt M_2X`
`MX gtM_2 X gtMX_3`

Solution :`M_2X to2M^(+)+X^(2-)`
` s_1"" 2s_2 ""s_1`
`k_(sp )= 4s_(1)^(3)or S_1=(K_(sp) //4) ^(1//3)`
`MxtoM^++X^- ,K_(sp)= s_(2)^(2)`
` orS_(2)= (K_(sp))^(1/2)`
`MX _(3)toM^(3+)+3X^(-)`
` K_(sp )= 27s_(3)^(4)ors_(3)= (K_(sp) //27 ) ^(1//4)`
Evidently`S_2gt S_1gt S_3`


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