What is the old name for HCl?

Written by Editorial Team | Last Updated: August 2026

Hydrochloric acid was historically known by several traditional alchemical and common names, most famously muriatic acid (derived from the Latin word muria, meaning brine or salt) and spirits of salt. Early chemists produced this corrosive liquid by heating sea salt with green vitriol or sulfuric acid. While modern chemical nomenclature officially designates it as aqueous hydrogen chloride, the old label "muriatic acid" remains widely used in industrial hardware and swimming pool maintenance contexts today.

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