91影视

Chemical synthesis or, alternatively, chemical breakdown into two or more separate chemicals occurs when one component interacts with another to generate a new material. These processes are known as chemical reactions, and they are generally irreversible until followed by other chemical reactions.

Silver is oxidised during the production of $\mathrm{Ag}(\mathrm{N}{\mathrm{H}}_3{{)}_2}^{+}$.

$\begin{array}{c}\mathrm{Oxidation}:{\mathrm{Ag}}_{\left(\mathrm{s}\right)}+2{\mathrm{NH}}_{3\left(\mathrm{aq}\right)}鈫�\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_{2\left(\mathrm{aq}\right)}^{+}+{\mathrm{e}}^{-}\\ {\mathrm{Reduction}:\mathrm{Ag}}_{\left(\mathrm{aq}\right)}^{+}+{\mathrm{e}}^{-}鈫�{\mathrm{Ag}}_{\left(\mathrm{s}\right)}\\ {\mathrm{Reaction}:\mathrm{Ag}}_{\left(\mathrm{aq}\right)}^{+}+2{\mathrm{NH}}_{3\left(\mathrm{aq}\right)}鈫�\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_{2\left(\mathrm{aq}\right)}^{+}\end{array}$

$\begin{array}{c}{\mathrm{E}}_{\mathrm{oxidation}}^{\mathrm{o}}=0.37\mathrm{V}\\ {\mathrm{E}}_{\mathrm{reduction}}^{\mathrm{o}}=0.80\mathrm{V}\\ {\mathrm{E}}_{\mathrm{cell}}^{\mathrm{o}}=0.80\mathrm{V}-0.37\mathrm{V}\\ {\mathrm{E}}_{\mathrm{cell}}^{\mathrm{o}}=0.43\mathrm{V}\end{array}$

$\begin{array}{c}{\mathrm{螖骋}}^{\mathrm{o}}={-\mathrm{nFE}}_{\mathrm{cell}}^{\mathrm{o}}\\ =-1{\mathrm{e}}^{-}脳96,500\frac{\mathrm{C}}{{\mathrm{mole}}^{-}}脳0.43\mathrm{V}\\ =-41,495\mathrm{J}\end{array}$

${\mathrm{螖骋}}^{\mathrm{o}}=-\mathrm{RTlnK}$in Action the for may be calculated as:

$\begin{array}{c}-41,495=-\mathrm{RTlnK}\\ \mathrm{lnK}=\frac{41,495\mathrm{J}}{\mathrm{RT}}\\ {\mathrm{K}}_{\mathrm{sp}}=\mathrm{e}\frac{41,495\mathrm{J}}{\mathrm{RT}}\\ {\mathrm{K}}_{\mathrm{sp}}=\mathrm{e}\frac{41,495\mathrm{J}}{298\mathrm{K}脳8.314\frac{\mathrm{J}}{\mathrm{molK}}}\\ {\mathrm{K}}_{\mathrm{sp}}=1.88脳{10}^7\end{array}$

Therefore, the value is$1.88脳{10}^7$.