It's not water, but this substance hydrolyses gluten to isolate glutamic acid during the production of MSG, and it is produced along with a plastic during the halogenation of ethylene. This compound and zinc amalgam reduces ketones to alkanes in a reaction named for Clemmensen. Involved in the production of PVC, three parts of this compound mixed with one part of nitric acid can dissolve gold or platinum, while its reaction with sodium hydroxide yields water and table salt. It is commonly found in aqua regia as well as 
It's not water, but this substance hydrolyses gluten to isolate glutamic acid during the production of MSG, and it is produced along with a plastic during the halogenation of ethylene. This compound and zinc amalgam reduces ketones to alkanes in a reaction named for Clemmensen. Involved in the production of PVC, three parts of this compound mixed with one part of nitric acid can dissolve gold or platinum, while its reaction with sodium hydroxide yields water and table salt. It is commonly found in aqua regia as well as stomach acid. For 10 points, name this strong diatomic acid with chemical formula HCl.
It's not water, but this substance hydrolyses gluten to isolate glutamic acid during the production of MSG, and it is produced along with a plastic during the halogenation of ethylene.
{hydrochloric} acid [or {spirits of salt}; or {muriatic} acid; or {HCl} before mention]