1.

100 mL of a saturated solution of M""_(2)SO""_(4) is giving 24 disintegrations per hour due to radio active metal "M" (lamda=2xx10""^(-17)hour""^(-1),N""_(0)=6xx10""^(23)a). If the solubility product of the salt is "x"xx10""^(-3y). What is (x+y)?

Answer»


Solution :`(-DN)/(dt)=lamdaN,24=2xx10""^(-17)x("moles")6XX10""^(23)`
moles of `M""^(+)=2xx10""^(6)`,molarity of `M""^(+)=2xx10""^(-5)`M
`M""_(2)SO""_(4)hArr2M""^(+)+SO""_(4)""^(-2)`
`2S=10""^(-5)M,K""_(sp)=4S""^(3)=4xx10""^(-15)`


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