When an electrical current is applied to an aqueous solution of lithium sulfide, hydrogen gas will be produced at the cathode and sulfur will be produced at the anode.
At the cathode, positively charged hydrogen ions (H+) gain electrons and are reduced to hydrogen gas (H2).2H+ + 2e- → H2
At the anode, negatively charged sulfide ions (S2-) lose electrons and are oxidized to form elemental sulfur (S).
S2- → S + 2e-
It's worth noting that lithium ions (Li+) will also be present in the solution but they will not be produced at either the anode or cathode.
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