A solution contains `1.4 xx 10^(-3)M AgNO_(3)`. What concentration of `KC1` will be required to initiate the precipitation of `AgC1 ? K_(sp) AgC1 = 2.8 xx 10^(-10)`

Answer

A, B

Explanation

To initiate precipitation of `AgC1`,
`Q_(sp) = K_(sp)`
`AgC1 hArr Ag^(o+) + C1^(Theta)`
Let `xM` of `NaC1` is required.
`:. [x] xx 1.4 xx 10^(-3) = 2.8 xx 10^(-10)`
`:. [x] = (2.8 xx 10^(-10))/(1.4 xx 10^(-3))`
`= 2 xx 10^(-7)M`.