# What is the strongest acid?

**URL:** <https://boards.straightdope.com/t/what-is-the-strongest-acid/19644>\
**Category:** Factual Questions\
**Created:** [May 16, 2000, 3:22am UTC](https://boards.straightdope.com/t/what-is-the-strongest-acid/19644 "2000-05-16T03:22:12Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![jayron\_32](https://avatars.discourse-cdn.com/v4/letter/j/41988e/32.png) [@jayron\_32](https://boards.straightdope.com/u/jayron_32)\
**Post date:** [May 18, 2000, 2:42pm UTC](https://boards.straightdope.com/t/what-is-the-strongest-acid/19644/21 "2000-05-18T14:42:59Z")

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> [@](#):
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> Hydrogen chloride (the gas) is the infamous ‘mustard gas’ of WWI

Mustard gas is usually either phosgene (Cl[sub]2[/sub]C=O) or dichlorodiethylsulfide, already cited. It was never HCl.

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