why hemihydrate is known as plaster of Paris ?
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Plaster of paris, quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry. Known since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found near Paris.
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Because No. of water crystals present in Plater of Paris is 1/2 as its formula is CaSO4.1/2H2O
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