What Is the Charge on a Sulfate Ion?

The formal charge of the sulfate ion, which has the molecular formula (SO₄)^2-, is -2. Ions that have a negative charge are called anions, and positively charged ions are called cations.

The sulfate ion has a two-dimensional structure, and its shape is tetrahedral. The bond angles between the four oxygen and sulfur atoms is 109.5 degrees.

The sulfate ion, which is a polyatomic ion, is found in different chemical compounds. These compounds include hydrogen sulfate, sodium hydrogen sulfate and ammonium sulfate. Hydrogen sulfate is also called sulfuric acid with the formula H₂SO₄. Sodium hydrogen sulfate is an acid salt, which is an ionic compound with the chemical formula NaHSO₄.

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