Oxidation of manganese(II) sulfate


Chemicals needed

manganese(II) sulfateGSGESUND.gif (476 Byte) Xn    R 48/20/22    S (2)-22

sodium hydroxide solution 7.5%  GSATZEND.gif (935 Byte) C    R 35     S (1/2)-26-37/39-45

hydrogen peroxide solution 3.5%


Equipment needed

test tube


Test procedure


Disposal

The diluted reaction mixture can be discharged into the drainage.

Elucidation

Hydrogen peroxide in an alkaline milieu acts oxidizing towards manganese(II), the result is manganese(IV) oxide. That oxygen escapes is to be attributed to the fact that manganese(IV) oxide catalyzes the decomposition of hydrogen peroxide.

Mn(OH)2 + H2O2 --> MnO2.H2O + H2O

2 H2O2 --> 2 H2O + O2


Photos

Precipitation of manganese(IV) oxide and development of oxygen


Literature

derived from experiment 5., "MnSO4 + H2O2",p.83, [7]