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
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