1.

A solution is saturated with respect to SrCO_3 and SrF_2. The [CO_3^(2-)] was found to be1.2 xx 10^(-3)M.The concentration of F^(-)in the solution would be :(K_(sp)of SrCO_3 = 7xx 10^(-10)K_(sp)of SrF_2 =8xx 10^(-10))

Answer»

` 1.3 XX 10^(-3) M`
` 2.6 xx 10^(-2)M`
` 3.7 xx 10^(-2) M`
` 5.8 xx 10^(-7) M`

Solution :`[Sr^(+2) ][CO_3^(2-)] =KsP_1 ,[Sr^(+2) ][F^(-) ] ^(2) = Ksp_2`
`rArr [F^(-) ]^(2) =(Ksp_2)/(Ksp_1) xx [CO_3^(2-)]`
` [F^(-)]^(2)=(8xx 10^(-10))/( 7 xx 10 ^(-10)) xx 1.2 xx 10 ^(-3)`
` [F^(-)] =3.7 xx 10 ^(-2)`


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