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Other tests that could be performed to come to a verify your alum include a potassium flame test which would burn the potassium within the alum to be compared and/or a colorimetric determination of alum test by observing the absorption rate of our alum. 
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The tests that can be used to determine the composition of alum are:

  • Compare the melting temperature with the recognised value of alum (92.5°C)
  • Find out the water of hydration that are in the alum crystals
  • Check the % of sulphur in the alum sample

Alum is a chemical compound which is formed through the combination of sulphur and aluminium.

Its chemical formula is X Al(SO. 4) 2·12H2O.

The composition of alum includes:

  • Aluminium sulphate
  • Water of hydration
  • Sulphur + any other element

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