Calcium Carbonate Hexahydrate
(Ca C O3 6H20)
The number you would write before water in the formula for calcium carbonate hexahydrate would be 6.
Facts about Calcium Carbonate Hexahydrate:
This compound often crystallises when Essex river waters are softened by the lime/soda process. Formation of the hydrated salt is favoured by low water temperatures and by high orthophosphate levels. Calcium carbonate hexahydrate forms pure well-defined crystals which are considerably more soluble in water than calcite, the usual product of lime/soda softening.
