Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

ammonia - History, Synthesis and production, Biosynthesis, Properties, Uses

NH3, boiling point ?33°C. A colourless gas with a pungent odour; its molecule is pyramidal with bond angles c.107°C. It is a weak base; aqueous solutions partially neutralized with strong acid have a pH c.9·5. It reacts with acids to form ammonium ions. An important industrial chemical, it is mainly prepared by the Haber process.

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