# Heating ammonium salt solution makes acid?

**URL:** <https://boards.straightdope.com/t/heating-ammonium-salt-solution-makes-acid/525926>\
**Category:** Factual Questions\
**Created:** [January 22, 2010, 12:21am UTC](https://boards.straightdope.com/t/heating-ammonium-salt-solution-makes-acid/525926 "2010-01-22T00:21:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://boards.straightdope.com/u/matt)\
**Post date:** [January 22, 2010, 12:21am UTC](https://boards.straightdope.com/t/heating-ammonium-salt-solution-makes-acid/525926/1 "2010-01-22T00:21:09Z")

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If you have an aqueous solution of an ammonium salt e.g. ammonium chloride or ammonium sulphate, can you drive off ammonia by heating? Does this leave you with residual hydrogen chloride or hydrogen sulphate, making an acid solution?