What is the charge on the hydronium ion?

1+

Explanation:

When a hydrogen cation reacts with a molecule of water, it forms a hydronium cation, according to the following reaction.

H⁺(aq) + H₂O(l) → H₃O⁺

Each hydrogen atom has charge of +1, while the oxygen atom has a charge of 2-. The net charge of the hydronium ion is:

3.(H) + 1.(O) = 3.(1+) + 1.(2-) = 3 - 2 = 1+

The charge of the hydronium ion is 1+.