Can the solution of HCl(g) in NH3(I) be considered as an Arrhenius acid-base?
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Solution
Arrhenius acid-base model is restricted to compounds that have H+ or OH− ions.
It is restricted to aqueous solutions.
It does not explain acid-base reactions that occur in non-aqueous solvents or in the gas phase where dissociation does not take place.
Hence Arrhenius theory does not consider the reaction of NH3(g)+HCl(g)⟶NH4Cl(s) as an acid-base reaction since there are no H+ ions are OH− ions in solution.