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

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

Citric Acid Monohydrate of the British Pharmacopoeia.

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

Dissolve 0.5 g in 10 mL of water, add 0.1 mL of thioglycollic acid R, mix and make alkaline with ammonia. Dilute to 20 mL with water. No pink colour appears in the solution.