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# Calcium Sulphate Hemihydrate is also known as _______.

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## Calcium Sulphate Hemihydrate ${\mathrm{CaSO}}_{4}.\frac{1}{2}{\mathrm{H}}_{2}\mathrm{O}$ also known as plaster of Paris is a neutral salt formed by heating the gypsum $\mathrm{CaSO}.2{\mathrm{H}}_{2}\mathrm{O}$at 373K. The heating is required to remove the water of crystallization from the gypsum. It has the property to absorb 3/2 of water of crystallization when exposed to air and converting into a hard mass. $\mathrm{CaSO}.2{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{aq}\right)\stackrel{373\mathrm{K}}{\to }{\mathrm{CaSO}}_{4}.\frac{1}{2}{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{aq}\right)+\frac{3}{2}{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{l}\right)\phantom{\rule{0ex}{0ex}}\mathrm{Gypsum}\mathrm{Plaster}\mathrm{of}\mathrm{paris}$Hence, Calcium Sulphate Hemihydrate is also known as Plaster of Paris (${\mathrm{CaSO}}_{4}.\frac{1}{2}{\mathrm{H}}_{2}\mathrm{O}$)

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