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A well is dry in a bed of rock containin...

A well is dry in a bed of rock containing fluorspar `(CaF_(2))`. If the well contains `20,000 L` of `H_(2)O`, what is the amount of `F^(-)` in it
`K_(SP)` of `CaF_(2) = 4 xx 10^(-11)`

A

`4.3` mole

B

`6.8` mole

C

`8.6` mole

D

`13.6` mole

Text Solution

Verified by Experts

The correct Answer is:
C
`CaF_(2) hArr Ca^(2+) + 2F^(-)`
`K_(SP) = 4S^(3) = 4 xx 10^(-11)`
`rArr S = 2.15 xx 10^(-4) M`
Amount of `F^(-)` in `20,000 L` Sol. `= 2 xx 20,000 xx 2,15 xx 10^(-4) = 8.6` mole
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