The purpose of the stream of air in the leach | vedclass

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Question

(B) In the leaching of $Ag_2S$ (silver sulphide) with aqueous $NaCN$,the reaction is reversible:$Ag_2S + 4 NaCN \rightleftharpoons 2 Na[Ag(CN)_2] + Na

Vedclass · Accepted Answer

Oxidise $Na_2S$ formed into $Na_2SO_4$

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(B) In the leaching of $Ag_2S$ (silver sulphide) with aqueous $NaCN$,the reaction is reversible:$Ag_2S + 4 NaCN \rightleftharpoons 2 Na[Ag(CN)_2] + Na_2S$To drive the reaction forward,the product $Na_2S$ must be removed.$A$ stream of air (oxygen) is passed through the solution to oxidise $Na_2S$ into $Na_2SO_4$ (sodium sulphate) and sulphur,preventing the reverse reaction.The overall reaction is: $2 Na_2S + 2 O_2 + H_2O \rightarrow Na_2SO_4 + 2 NaOH + S$ (or similar oxidation products like $Na_2SO_4$).

The purpose of the stream of air in the leaching process of $Ag_2S$ is to:

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