Redox

Redox reaction of Copper (II) ions with aqueous potassium iodide (equations and products)

2Cu2+ (aq) + 4I- (aq) —> 2CuI (s) + I2 (aq)

Copper(I) iodide is precipitated as a white solid and iodine is produced

Reduction of Hydrogen Peroxide solution (1/2 equation)

H2O2 + 2H+ + 2e- —> 2H2O

Oxidation of Hydrogen Peroxide solution (1/2 equation)

H2O2 —> O2 + 2H+ + 2e-

Decomposition of Hydrogen Peroxide (Disproportionation reaction)

2H2O2 —> 2H20 + O2

Oxidation of iodide ions to iodine (1/2 equation)

2I- —> I2 + 2e-

Oxidation of thiosulphate ions (S2O32-) (1/2 equation)

2S2O32- —> S4O62- + 2e-

Redox reaction of iodine and thiosulphate ions

2S2O32- + I2 —> S4O62- + 2I-

Disproportionation of water and chlorine

H20 + Cl2 —> HClO + HCl

Redox of Ethanol and Dichromate

2CrO7 2- + 16H+ + 3C2H5OH —> 4Cr 3+ + 11H2O + 3CH3COOH

Reduction of

Disproportionation

The simultaneous oxidation and reduction of the same species

Redox reaction

A reaction in which one species is oxidised and loses electrons and another species is reduced and gains electrons simultaneously