Sodium thiosulphate- - Na - 2 - S - 2 - O - 3 -cdot 5- H - 2 -O is used in photography to -reduce the silver bromide to metallic silverremove undecomposed AgBr as soluble thiosulphate complexconvert the metallic silver to silver saltremove reduced silver

Question

Toppr Admin · Accepted Answer

Silver bromide reacts with sodium thiosulphate solution to form sodium argentothiosulphate $N a_{3} [A g (S_{2} O_{3})_{2}]$ which is water-soluble.

$A g B r (s) + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}]$

Thus, undecomposed AgBr can be removed as soluble thiosulphate complex.

Sodium thiosulphate, Na2S2O3⋅5H2O is used in photography to :reduce the silver bromide to metallic silverremove undecomposed AgBr as soluble thiosulphate complexconvert the metallic silver to silver saltremove reduced silver

Silver bromide reacts with sodium thiosulphate solution to form sodium argentothiosulphate Na3[Ag(S2O3)2] which is water-soluble.AgBr(s)+2Na2S2O3→Na3[Ag(S2O3)2]Thus, undecomposed AgBr can be removed as soluble thiosulphate complex.

Sodium thiosulphate, ${N a}_{2} S_{2} O_{3} \cdot 5 H_{2} O$ is used in photography to :
reduce the silver bromide to metallic silver
remove undecomposed $A g B r$ as soluble thiosulphate complex
convert the metallic silver to silver salt
remove reduced silver

Silver bromide reacts with sodium thiosulphate solution to form sodium argentothiosulphate $N a_{3} [A g (S_{2} O_{3})_{2}]$ which is water-soluble.

$A g B r (s) + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}]$

Thus, undecomposed AgBr can be removed as soluble thiosulphate complex.