A-LevelChemistryChemical bonding9701/12 · Feb/Mar 2016 · Q191 Mark
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?
Ato make the silver ions soluble
Bto oxidise the silver ions
Cto reduce the bromine
Dto reduce the silver ions
✓ Correct answer
A: to make the silver ions soluble
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