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Colorimetric Determination of Manganese in Steel

  • Essay length: 964 words
  • Submitted: 05/09/2007
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GCSE Aqueous Chemistry

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Spectrophotometric Determination of Manganese in Steel

Introduction

The aim of this experiment was to determine the average percentage concentration of manganese in steel. This is useful when it is necessary to determine the strength of the steel.

Spectrophotometric analysis was used in this experiment. This is a technique that can be successfully used to determine the concentrations of coloured substances in solution.

It works on the basis that a coloured substance absorbs light of a colour complementary to its own and also that the amount of light absorbed is proportional to the substance's concentration.Spectrophotometric analysis was relevant in this experiment because the permanganate ions that are formed from the manganese were coloured, allowing spectrophotometry to be used to work out the absorbance by absorbing all the other colours other than the colour of the permanganate ions.

The conversion of the manganese into permanganate ions took place in two stages. Firstly, the manganese was oxidised to manganese ions using the oxidising agent, nitric acid:

3 Mn (s) + 2 NO3- (aq) + 8 H+ (aq) --> 3 Mn2+ (aq) + 2 NO (g) + 4 H20 (l)

Then the manganese

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