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Almost all ionic compounds with sulfate anions are soluble in water at standard temperature and pressure (the exceptions include CaSO₄, SrSO₄, and BaSO₄).

The acid of the sulfate ion is H₂SO₄, called sulfuric acid.

Sulfates are important in both chemical industry and biological systems:

• The Lead-acid battery typically uses sulfuric acid.
• Organisms living near deep sea thermal vents depend on sulfates for energy in lieu of the sunThe Sun (also called Sol is the star in our solar system. Planet Earth orbits the Sun. Other bodies that orbit the Sun include other planets, asteroids, meteoroids, comets and dust. Not all objects passing through the solar system have been orbitally capt.
• Copper sulfate is a common algaecide.
• Magnesium sulfateMagnesium sulfate (commonly called Epsom salts in hydrated form) is a chemical compound with formula MgSO. 7HO Epsom salt was originally prepared by boiling down mineral waters at Epsom, England and afterwards prepared from sea water. In more recent times, commonly known as Epsom salts, is used in therapeutic baths.