Skip to content

ELECTRODE REACTIONS

Chemistry

ELECTRODE REACTIONS

Cathode reactions (reduction) (-) negative cathode where reduction of the attracted positive cations is by electron gain (reduction) to form metal atoms or hydrogen [from Mn+ or H+, n = numerical charge]. The electrons come from the positive anode. Hydrogen ions are reduced to hydrogen gas molecules. Electrolysis of many dilute salts or acid solutions make hydrogen gas by reduction as shown. 2H+(aq) + 2e- H2(g) Copper (II) ions are reduced to copper atoms in the electrolytic purification or electroplating using copper (II) sulphate solution. Cu2+(aq) + 2e–┬áCu(s) Silver ions reduced to silver atoms in silver electroplating Ag+(aq) + e- Ag(s)   Anode reactions (oxidation) Positive anode is where the oxidation of the atom or anion is by electron loss. Non-metallic negative anions are attracted and may be oxidised to the free element. For example, in the electrolysis of molten chloride salts or their concentrated aqueous solution or conc. hydrochloric… Read More »ELECTRODE REACTIONS

School Portal NG
error: Content is protected !!