What is the concentration of Pb^(2+) whe...

What is the concentration of `Pb^(2+)` when `PbSO_(4)` `(K_(sp)=1.8xx10^(-8)) begins to precipitate from a solution that is 0.0045 M in `SO_(4)^(2-)`?

`4.0xx10^(-8)` M

`1.0xx10^(-6)` M

`2.0xx10^(-8)` M

`4.0xx10^(-6)` M

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