what is sulfate
sulfate (SO 4 2-). [sulâ²fÄt]. an anion of sulfuric acid. A sulfate is usually a combination of a metal with sulfuric acid. Natural sulfate compounds, such as sodium sulfate, calcium sulfate, and potassium sulfate, are plentiful in the body.sulâ²fÄt]. an anion of sulfuric acid. A sulfate is usually a combination of a metal with sulfuric acid. Natural sulfate compounds, such as sodium sulfate, calcium sulfate, and potassium sulfate, are plentiful in the body.