Calcium Potassium Pertantalate, CaKTa₂O₈.4.5H₂O

Calcium Potassium Pertantalate, CaKTa₂O₈.4.5H₂O, is precipitated as a crystalline powder by the action of potassium pertantalate on calcium chloride solution. It forms rhombic prisms insoluble in cold water. It is decomposed by warming with water, the acid separates and the solution becomes alkaline.