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[SO4^(2-) ] must be exceed what value t...

`[SO_4^(2-) ] ` must be exceed what value to obtain a ` RaSO_4 (K_(sp) =4xx 10^(-11)) ` ppt in 500 mL of a solution containing `1xx10^(-4) "mole" of Ra^(2+)` ions ?

A

` 4 xx 10^(-7) M`

B

` 2xx10^(-7) M`

C

` 0.001 M`

D

` 0.01 M`

Text Solution

Verified by Experts

The correct Answer is:
B
` IP gt KsP `
` (10 ^(_4) ) [SO_4^(2-) ] gt 4 xx1 0^(-11) rArr [SO_4^(2-) ] gt 4 xx 10 ^(-7) `
moles ` = 4xx 10 ^(-7) xx 0.5 = 2 xx 10 ^(_7) `
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