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

Hydrogen Sulphide
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Hydrogen Sulphide H2S  =  34.08 (7783-06-4)

Use laboratory cylinder grade of commerce, or prepare the gas by the action of hydrochloric acid, diluted with an equal volume of water, on iron sulphide; wash the resulting gas by passing it through water.

A colourless, poisonous gas.