Chemistry

Problem

50.0\;\text{mL}

sample of

0.020\;\text{M}

\mathrm{Pb^{2+}}

is titrated with

0.100\;\text{M}

potassium iodide. Assuming volumes are additive and temperature is

25^\circ\text{C}

, what minimum volume of the iodide solution must be added before solid

\mathrm{PbI_2}

begins to form? (

K_{sp}(\mathrm{PbI_2}) = 7.1\times10^{-9}

) a)

0.95\ \text{mL}

3.0\ \text{mL}

0.30\ \text{mL}

1.3\ \text{mL}