Aqueous electrolysis: Chemical reactions: Chemistry: (9:1)

Ions in water

H+ and OH-

H+ is attracted to

Cathode

Discharge of H+

2H+ +2e- --> H2

OH- is attracted to

Anode

Discharge of OH-

4OH- --> O2 + 2H2O + 4e-

Discharged at the cathode in solution

Least reactive element

Discharged at the anode in solution

Halide ions, if present, otherwise OH-

Halide ion

a negative ion formed from a group 7 element

Test for hydrogen

Lit splint produces a squeaky pop

Metals discharged in preference to hydrogen

Copper, Silver, Gold, Platinum

Test for chlorine

Bleaches damp litmus paper

Test for oxygen

Relights a glowing splint

Electroplating

The process of depositing a thin layer of metal on an object using electrolysis.

Electroplating cathode

The object to be plated.

Electroplating anode

The metal you want to plate with

Electroplating solution

Ions of the plating metal

Purifying copper

A form of electrolysis where impure copper is the cathode and pure copper is the anode.