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1. $H^+$ (in acid medium) |
$S^{2-}+2H^+$ $\longrightarrow$ $H_2S$ (-> hydrogen sulfide gas, foul smell) |
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2. $[Fe^{III}(CN)_5NO]^{2-}$ (Sodium pentacyanonitrosylferrate(III)) |
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In a strongly basic medium: $[Fe^{III}(CN)_5NO]^{2-}$ $+$ $S^{2-}$ $\longrightarrow$ $[Fe^{III}(CN)_5NO\;S]^{4-}$ (-> complex unstable and purple anion, to experiment with a solution of $H_2S$ supplemented with $KOH$) |