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What is the formula for hydrochloric acid?
Formally it is ##HCl(aq)##.
##"Hydrogen chloride"## is a gas at room temperature, ##"boiling point "=-85.1^@## ##C##.
##"Hydrogen chloride"## is exceptionally water soluble, in which it undergoes almost complete ionization:
##HCl(g) +H_2O(l) rarr H_3O^(+) + Cl^-##
The anion and the cation are solvated by several water molecules.