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

Formic Acid, Anhydrous
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Formic Acid, Anhydrous CH2O2 = 46.03

Analytical reagent grade formic acid of commerce containing not less than 98.0% w/w of CH2O2.

A colourless, corrosive liquid; bp2013_v5_47_1003_[appendix_i_a]_f d_20_20.png, about 1.22.

Assay Weigh accurately a conical flask containing 10 mL of water, quickly add about 1 mL of the reagent and weigh again. Add 50 mL of water and titrate with 1m sodium hydroxide VS using 0.5 mL of phenolphthalein solution as indicator. Each mL of 1m sodium hydroxide VS is equivalent to 46.03 mg of CH2O2.