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Answered 2008-12-15 09:50:01

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 techincally 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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Why is HCL gas not an acid but HCL aqueous an acid?

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they both are same as HCl is a monobasic acid.>>>Not exactly. N stands for normal and M stands for mole. Knowing that, read this article to know the difference:http://answers.yahoo.com/question/index?qid=20070625100319AALNjoW


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