How do you write an equation showing how HCl, which is a molecular substance and strong acid, could give ions when added to water?

1 Answer
Mar 10, 2017

Answer:

#HCl(g) + H_2O(l) rarr H_3O^+ + Cl^(-)#

Explanation:

As you say, hydrogen chloride is a room temperature gas; however, it is mighty soluble in water. And in water we conceive that it protonates the water molecular to give #H_3O^+#. #HCl# PROTONATES the water solvent to form water-solvated hydronium ions and chloride ions......

#H_3O^+#, the so-called hydronium ion, is our conception of a protonated water molecule. So far as anybody knows, it is a cluster of 2-4 water molecules with AN EXTRA #H^+# incorporated in the cluster, i.e. #H_5O_2^+# or #H_7O_3^+#. We call it #H_3O^+# or even #H^+# for convenience. The extra proton can rapidly move, or even tunnel if you like, from cluster to cluster.....