Scandium potassium sulphate, K₃Sc(SO₄)₃

Scandium potassium sulphate, Sc₂(SO₄)₃.3K₂SO₄ or K₃Sc(SO₄)₃, is obtained by adding an excess of potassium sulphate to a solution of scandium sulphate. It is moderately soluble in water and dilute potassium sulphate solution, but practically insoluble in a saturated solution of potassium sulphate. In this respect scandium resembles the metals of the cerite earths.