First slide

Applications of complexes

Question

In photography, sodium thiosulphate is used as

Easy

A

Complexing agent
B

Oxidising agent
C

Reducing agent
D

None of these

Solution

In order to make the image permanent, it is necessary to remove the unreduced silver bromide from the surface of the developed film. This operation is called fixing of image. Fixing is done by dipping the developed film or plate in sodium thiosulphate (hypo) solution. The hyposolution dissolves the unreduced silver bromide by forming a complex.
$AgBr + 2 {Na}_{2} S_{2} O_{3} \to \underset{Sodium argentothiosulphate (soluble)}{{Na}_{3} [Ag {(S_{2} O_{3})}_{2}]} + NaBr$
Thus sodium thiosulphate acts as a complexing agent.

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