`color{green}(β’)` Gypsum contains two water molecules as water of cyrstallisation.
`color{green}(β’)` It has the formula `color{red}(CaSO_4 .2H_2O)`.
`color{green}(β’)` On heating gypsum at `color{red}(373 K)`, it loses water molecules and becomes calcium sulphate hemihydrate ( `color{red}(CaSO_4 . 1/2H_2O )` ). This is called ππ₯ππ¬πππ« π¨π πππ«π’π¬.
`color{green}(β’)` Plaster of paris is used for supporting fractured bones in the right position, for making toys, materials for decoration and for making surfaces smooth.
`color{green}(β’)` Plaster of Paris is a white powder and on mixing with water, it changes to gypsum once again giving a hard solid mass.
`color{red}(underset("(Plaster of Paris)")( CaSO_4 . 1/2 H_2O ) +1 1/2 H_2O β underset("(Gypsum)")(CaSO_4 . 2 H_2O))`
Two formula units of `color{red}(CaSO_4)` share one molecule of water therefore only half a water molecule is shown to be attached as water of crystallisation.
Calcium sulphate hemihydrates is called βππ₯ππ¬πππ« π¨π πππ«π’π¬β
`color{green}(β’)` Gypsum contains two water molecules as water of cyrstallisation.
`color{green}(β’)` It has the formula `color{red}(CaSO_4 .2H_2O)`.
`color{green}(β’)` On heating gypsum at `color{red}(373 K)`, it loses water molecules and becomes calcium sulphate hemihydrate ( `color{red}(CaSO_4 . 1/2H_2O )` ). This is called ππ₯ππ¬πππ« π¨π πππ«π’π¬.
`color{green}(β’)` Plaster of paris is used for supporting fractured bones in the right position, for making toys, materials for decoration and for making surfaces smooth.
`color{green}(β’)` Plaster of Paris is a white powder and on mixing with water, it changes to gypsum once again giving a hard solid mass.
`color{red}(underset("(Plaster of Paris)")( CaSO_4 . 1/2 H_2O ) +1 1/2 H_2O β underset("(Gypsum)")(CaSO_4 . 2 H_2O))`
Two formula units of `color{red}(CaSO_4)` share one molecule of water therefore only half a water molecule is shown to be attached as water of crystallisation.
Calcium sulphate hemihydrates is called βππ₯ππ¬πππ« π¨π πππ«π’π¬β