Question

To determine the percentage of manganese in the given sample of plain carbon steel

Answer 1

The manganese content of most steels is quite low (<1%). It is therefore difficult quantitatively to analyze for Mn in the presence of large amounts of iron by purely chemical techniques. A colorimetric method based on the characteristic purple color of the permanganate ion, MnO4-, however, yields accurate results. The method is based on the dissolution of the steel in nitric acid which also oxidizes the Mn to Mn2+. The reaction involved is:

3Mn + 2NO3- + 8H+<===> 3Mn2+ + 2NO + 4H2O

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