9701/12/F/M/16 Q19

Question

Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

After black and white photographic film has been developed, unreacted silver bromide is removed
by reaction with sodium thiosulfate.
AgBr + 2Na2S2O3 → 4Na+
+ Br –
+ [Ag(S2O3)2]
3–
What is the function of the thiosulfate ion?
A to make the silver ions soluble
B to oxidise the silver ions
C to reduce the bromine
D to reduce the silver ions

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