Armstrong's acid

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Armstrong's acid
Naphthalene-1,5-disulfonic acid.png
Armstrong's acid ball-and-stick animation.gif
CAS number 81-04-9
PubChem 6666
ChemSpider 6414 YesY
Jmol-3D images Image 1
Image 2
Molecular formula C10H8S2O6
Molar mass 288.299 g/mol
Main hazards corrosive
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Armstrong's acid (naphthalene-1,5-disulfonic acid) is a strong acid which is related to toluenesulfonic acid and is used in chemical synthesis. It was named for British chemist Henry Edward Armstrong.[1] It is sometimes used as a divalent counterion for forming salts of basic drug compounds, as an alternative to the related mesylate or tosylate salts. When used in this way such a salt is called a naphthalenedisulfonate salt, as seen with the most common salt form of the stimulant drug CFT.


  1. ^ Senning, Alexander (2007). Elsevier's dictionary of chemoetymology. Elsevier. p. 30. ISBN 978-0-444-52239-9.