Plaster of Paris is chemically calcium sulphate monohydrate.

S_(2) : Plaster of paris is a hemihydrate of calcium sulphate obtained by heating the gypsum above 393K . S_(2) : Sodium carbonate is used in water softening. S_(4) : The order of mobilities of the alkali metal ions in aqueous solutions is Li^(+)gtNa^(+)gtK^(+)gtRb^(+)gtCs^(+)

Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to 200^(@) C, it forms anhydrous salt. Q. When calcium sulphate is mixed with conc. HCl and the paste is formed. What colour is obtained wehn a pinch of this paste is brought near the flame?

A : Magnesium sulphate is heptahydrate where as calcium sulphate is dihydrate. R : Mg and Ca belongs to Group II.

Write the chemical name of Plaster of Paris. Write the chemical equation of its preparation. Why should Plaster of Paris be stored in a dry place ?

The plaster of paris is hardened by

Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to 200^(@) C, it forms anhydrous salt. Q. The anhydrous calcium sulphate is called :

Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to 200^(@) C, it forms anhydrous salt. Q. What is the product formed when hydrated CaSO_(4) is heated to 125^(@) C instead of 200^(@)C ?

Give reasons for the following: a. Anhydrous calcium sulphate (anhydrite) cannot be used as plaster of Paris.

Setting of plaster of paris is

Setting of plaster of paris is