Chemistry

Problem

A sample of water is

0.020\,\mathrm{M}

in Ag

^{+}

. Solid NaCl is added until

\mathrm{AgCl}

just starts to precipitate. If

K_{sp}(\mathrm{AgCl}) = 1.8 \times 10^{-10}

, what is the chloride ion concentration at that moment? a)

9.0 \times 10^{-8}\,\mathrm{M}

1.3 \times 10^{-5}\,\mathrm{M}

9.0 \times 10^{-9}\,\mathrm{M}

3.6 \times 10^{-12}\,\mathrm{M}