Electrolysis → passing an electric current through a solution containing ions
Recall that the cathode is where reduction occurs while the anode is where oxidation occurs.
Since Na2S is an ionic compound, it forms ions when dissociating in water.
Na2S(s) → 2Na+(aq) + S2–(aq)
During electrolysis, the cation is reduced/gains electrons while the anion is oxidized/loses electrons.
Na+ is reduced: Na+(aq) + 1 e– → Na (s); E˚ = -2.71 V
S2– is oxidized: S(s) + 2 H+ (aq) + 2 e- → H2S (g) E˚ = 0.14 V
Current is applied to an aqueous solution of sodium sulfide.
What is produced at the cathode?
What is produced at the anode?
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