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DIFFERENTIATE BETWEEN HYDROCHLORIC ACID & HYDROGEN CHLORIDE GAS.
HCl gas is molecular HCl in the gaseous phase, HCl acid is HCl in solution with water, and can be said to be in the form H+ Cl-. (Or to be a pendant, H3O+ Cl- as technically protons do not exist on their own in solution.) It is this dissociation of the molecule into constituent ions which gives an acid its properties.
On a physical level, HCl gas is a yellow/green gas, and HCl acid is a clear solution.


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