A sample of is to be treated with solid to produce the first trace of precipitate at

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

250\;\text{mL}

sample of

2.0\times10^{-5}\;\text{M}

\mathrm{AgNO_3}

is to be treated with solid

\mathrm{NaCl}

to produce the first trace of

\mathrm{AgCl}

precipitate at

25^\circ\text{C}

. Ignoring any change in volume, what mass of

\mathrm{NaCl}

(in mg) must be added? (

K_{sp}(\mathrm{AgCl})=1.8\times10^{-10}

; molar mass

\mathrm{NaCl}=58.44\;\text{g mol}^{-1}

) (a)

0.20\ \text{mg}

(b)

1.3\ \text{mg}

(c)

0.13\ \text{mg}

(d)

0.013\ \text{mg}