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State the chemical name of plaster of pa...

State the chemical name of plaster of paris . Write a chemical equation to show the reaction between plaster of paris and water.

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`CaSO_4.1/2 H_2O` (calcium sulphate hemihydrate)
When plaster of paris reacts with water gypsum is formed.
`CaSO_4. 1/2H_2O+1 1/2H_2Oto CaSO_4. 2H_2O`
(Plaster of paris) (Gypsum)
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