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


The diluted reaction mixture can be discharged into the drainage.


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


Precipitation of manganese(IV) oxide and development of oxygen


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