The recovery of silver from the solutions used in developing and fixing photographic film and prints present just such a problem. Silver is an expensive metal, and the recovery is profitable. Moreover, if not recovered, the silver ions would constitute and undesirable pollutant in water supplies
The equation in which silver recovered from such solution is : $A g_{2} C O_{3} Δ \to 2 A g + C O_{2} + \frac{1}{2} O_{2}$ .

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Solution

$[A g_{2} (S_{2} O_{3})]^{3 -}$ reacts with water to form $A g_{2} S$
$[A g_{2} (S_{2} O_{3})]^{3 -} H_{2} O \to A g_{2} S$
$A g_{2} S$ reacts with $N a_{2} C O_{3}$ to form $A g_{2} C O_{3}$
$A g_{2} S + N a_{2} C O_{3} \to A g_{2} C O_{3} + N a_{2} S$
Thermal decomposition of $A g_{2} C O_{3}$ gives Ag
$A g_{2} C O_{3} Δ \to 2 A g + C O_{2} + \frac{1}{2} O_{2}$

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[Ag2(S2O3)]3− reacts with water to form Ag2S[Ag2(S2O3)]3−H2O→Ag2SAg2S reacts with Na2CO3 to form Ag2CO3Ag2S+Na2CO3→Ag2CO3+Na2SThermal decomposition of Ag2CO3 gives AgAg2CO3Δ→2Ag+CO2+12O2