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

4-Hydroxybenzoic Acid
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4-Hydroxybenzoic Acid Parahydroxybenzoic acid; C7H6O3 = 138.1 (99-96-7)

Crystals, slightly soluble in water, very soluble in ethanol (96%), soluble in acetone.

Melting point, 214° to 215°.