CHXI11:THE P-BLOCK ELEMENTS
317071
Hypo is used in photography to
1 Remove reduced silver
2 Reduce \(\mathrm{AgBr}\) grains to metallic silver
3 Convert the metallic silver to silver salt
4 Remove undecomposed silver bromide as a soluble complex
Explanation:
\(\mathrm{AgBr}+2 \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \rightarrow \mathrm{Na}_{3}\left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]+\mathrm{NaBr}\)