Question

uses of plaster of Paris and its reaction

Answer 1

$\huge\bold{Answer:}$

Plaster paris can be used for construction. It is highly helpful in constructing statues and buildings, It can also be used as medicines and to repair broken bones.

Reaction:

Plaster of paris has generally low chemical composition, It decomposes at high temperature and it has a specific reaction with water and generate toxic oxides of sulphur and it produces gypsum (CaSO4 + 2H20 = Gypsum) when in reaction with water

$\small\bold\green{Thanks!!}$

Answer 2

Calcium sulphate with half a molecule of water per molecule of the salt (hemi-hydrate) is called plaster of paris (plaster of paris).

Preparation

plaster of paris is prepared by heating gypsum (CaSO4.2H2O) at 120°C in rotary kilns, where it gets partially dehydrated.

formation of plaster of paris

The temperature should be kept below 140°C otherwise further dehydration will take place and the setting property of the plaster will be partially reduced.

Properties

It is a white powder. When mixed with water (1/3 of its mass), it evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes. During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression.

Hope it is helpful