• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Citric Acid
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Citric Acid C6H8O7,H2O  =  210.1 (5949-29-1)

Analytical reagent grade of commerce.

When used in the limit test for iron , Appendix VII, complies with the following requirement.

Dissolve 0.5  g in 10  ml of water, add 0.1  ml of mercaptoacetic acid , mix, make alkaline with 10m ammonia and add sufficient water to produce 20  ml. No pink colour is produced.