Calcium chloride
History

Calcium chloride was apparently discovered in the 15th century but wasn't studied properly until the 18th century. It was historically called "fixed sal ammoniac " (Latin: sal ammoniacum fixum) because it was synthesized during the distillation of ammonium chloride with lime and was nonvolatile (while the former appeared to sublime); in more modern times (18th-19th cc.) it was called "muriate of lime" (Latin: murias calcis, calcaria muriatica).
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