Chemistry

Problem

A 25.0 mL sample of 0.0100 M

AgNO_3

is titrated with a potassium chromate solution. The solubility product for

Ag_2CrO_4

1.1\times10^{-12}

. Assuming the total volume change is negligible, what minimum concentration of

CrO_4^{2-}

must be reached in the mixture before

Ag_2CrO_4

just begins to precipitate? a)

1.1\times10^{-10}\,\text{M}

2.8\times10^{-9}\,\text{M}

1.1\times10^{-8}\,\text{M}

4.4\times10^{-8}\,\text{M}