This acid was responsible for water pollution as a byproduct of the Leblanc process.
This acid was responsible for water pollution as a byproduct of the Leblanc process. This acid and zinc chloride comprises the Lucas reagent, which distinguishes between classes of alcohols. This acid and zinc amalgam is used to reduce a carbonyl group to a methylene group in the Clemmensen reduction. A combination of nitric acid and this monoprotic acid is the liquid aqua regia, which is used to dissolve platinum and gold. This acid is released from the parietal cells in a dilute form as part of gastric acid. For 10 points, name this strong acid with formula HCl. 
This acid was responsible for water pollution as a byproduct of the Leblanc process.
HYDROCHLORIC ACID