Should a chemical cycle involving surface materials and atmospheric gases be involved with HCl, however, that would still represent a big win for science and the ExoMars Trace Gas Orbiter (TCO ...

Hydrochloric acid is a chemical most commonly used in cleaning products. According to the National Library of Medicine, hydrochloric acid is a colorless watery liquid with a sharp, irritating odor.

Hydrochloric acid is a vital component of gastric acid in the digestive systems of many animal species, including humans but it is also an important laboratory reagent and industrial chemical.