Knowledge for the Sulphuric Acid Industry
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Analytical Procedures - Acid Residue
December 19, 2002
The determination of residue in sulphuric acid is carried out by evaporating and calcining an acid sample to dryness and then directly weighing the residue.
Weigh and record the weight of the sample container. Place approximately 50 grams of acid sample into the capsule, weigh and record the total weight. Heat the acid sample gently with a Bunsen flame to evaporate the acid. This procedure should be done under a fume hood. Calcine at 750°C in furnace. Cool in essiccator and weigh again.
Residue % = GR / GA x 100
GR = weight in grams of residue
GA = weight in grams of acid sample