Is bubbled into a 0.02 M NaCN solution which is 0.02 M each in and

CHEMISTRY · Subjective · AP · Chemistry · Equilibrium · Equilibrium

Problem

\text{H}_2\text{S}

is bubbled into a 0.02 M NaCN solution which is 0.02 M each in

\text{Ag}(\text{CN})_2^-

and

\text{Cd}(\text{CN})_4^{2-}

. If

K_{sp}

\text{Ag}_2\text{S}

and

K_{sp}

\text{CdS}

are

1.0 \times 10^{-50}

and

7.1 \times 10^{-28}

and

K_{\text{instability}}

for

[\text{Ag}(\text{CN})_2^-]

and

[\text{Cd}(\text{CN})_4^{2-}]

are

1.0 \times 10^{-20}

and

7.8 \times 10^{-18}

, which sulphide will precipitate first.