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What is the physical state of pure hydrogen chloride?

Answer 1

Noah Aldrich

Pure #HCl# is a room temperature gas......

.......and it can be supplied in metal cylinders.....

And if you bubble the gas thru water, you get hydrochloric acid.....

#HCl(g) + H_2O(l) rarrH_3O^+ + Cl^-#

.....equivalently......

#HCl(aq) rarr H^+ + Cl^-#

The point is that #HCl(g)# is mighty soluble in water, to the tune of approx. #10.6*mol*L^-1# - this is conc. hydrochloric acid......this is the reagent they supply in bottles......

The hydronium ion, #H_3O^+#, is a conception not an actuality. As far as anyone knows, the actual species is a cluster of 3-4 water molecules with an EXTRA proton, i.e. #H_7O_3^+#, or #H_9O_4^+# - this is what we mean when we write #HCl(aq)#.......we write, without loss of generality, #H_3O^+# or even as #H^+#.

I have said much the same thing here.

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Answer 2

Henry Antrim

The physical state of pure hydrogen chloride is a colorless gas at room temperature and atmospheric pressure.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.