Question

What's the oxidation number of the oxygen in the compound H3O+?
And how you got it?

Answer 1

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Answer 2

The oxidation number of Oxygen in $H_3O^+$ is -2.

Explanation:

• As per the general rule for finding oxidation number, When H is bonded with non-metal it has oxidation number as 1.
• As in the given ion, hydrogen is bonded with non-metal oxygen and there are three hydrogen atom, the oxidation number of hydrogen atom is 3.
• As the oxidation number of oxygen must be identified, let it be considered as X.
• In an ion, the oxidation number must be added up to the charge of the ion.
• In the given case, the charge of ion is +1.

∴ +1 (3) + X = +1

3 + X = 1

X = 1-3

X = -2

∴ The oxidation number of the oxygen in the compound $H_3O^+$ is -2.

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