Answer :
When substances dissolve in water, they may interact with water chemically.
Dissolution of substances in water could result in a chemical reaction. In that case, the water interacts chemically with the substance and a chemical equation could be written for such an interaction.
The chemical equations that result from the interaction of the following substances with water are shown;
HCl + H2O ------> H3O^+ + Cl^-
NH4OH + H2O ------> NH4^+ + OH^-
C2H5OH + H2O --------> C2H5O^- + H3O^+
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