P-Toluenesulfonic acid

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

para-Toluenesulfonic acid (PTSA, pTSA, or pTsOH) or tosylic acid (TsOH) is an organic compound with the formula CH3C6H4SO3H. It is a white extremely hygroscopic solid that is soluble in water, alcohols, and other polar organic solvents.

Excerpt from the Wikipedia article “P-Toluenesulfonic acid”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Su-no-G, Public domain, via Wikimedia Commons.