Question

A hydrogen ion, H+, in aqueous solution may also be written as

(1) H2O (3) H3O+
(2) H2O2 (4) OH–

Answer 1

The answer is (3) H3O+. In solution, H+ exists interchangeably bound to H2O (as the hydronium ion) and as a free ion. Some books represent strong acids in net ionic equations as simply H3O+

Answer 2

Answer: Option (3) is the correct answer.

Step-by-step explanation:

In an aqueous solution, a compound exists in the form of ions that is in the form of protons and electrons.

Protons are positively charged and electrons are negatively charged. A proton (usually hydrogen ion,
`H^(+)`) in water (solvent) also exists as
`H_(3)O^(+)`.

For example,
`H_(2)O + HCl \rightleftharpoons H_(3)O^(+) + Cl^(-)`

This shows that the conjugate acid of
`H_(2)O` is
`H_(3)O^(+)`.

Thus, we can conclude that a hydrogen ion, H+, in aqueous solution may also be written as
`H_(3)O^(+)`.