Chemical and Ionic Equilibrium 1 Question 16
17. $\mathrm{Ag}^{+}+\mathrm{NH}{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right)\right]^{+} ; K_{1}=3.5 \times 10^{-3}$
$\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right)\right]^{+}+\mathrm{NH}{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right){2}\right]^{+} ; K_{2}=1.7 \times 10^{-3}$
then the formation constant of $\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right){2}\right]^{+}$is
(a)
(b)
(c)
(d) None of these
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Solution:
- $\mathrm{Ag}^{+}+\mathrm{NH}{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right)^{+}\right]$
$\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right)^{+}\right]+\mathrm{NH}{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right){2}^{+}\right] \quad K_{2}=1.7 \times 10^{-3}$
Adding : $\mathrm{Ag}^{+}+2 \mathrm{NH}{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}{3}\right)_{2}^{+}\right]$
