Question

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

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.

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 $H_{3}O^{+}$.