Write the chemical equation for the reaction when water is added to plaster of Paris.

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Solution

1. Plaster of Paris
Plaster of Paris (also known as Calcium sulphate hemihydrate) is represented by the chemical formula, ${CaSO}_{4} . 0.5 H_{2} O$ . It is used to produce gypsum having the chemical formula, ${CaSO}_{4} . 2 H_{2} O$ . The combination reaction of plaster of Paris with water yields gypsum.
2. Reaction of plaster of Paris with water
The chemical reaction of plaster of Paris with water is given below.+
${CaSO}_{4} . 0.5 H_{2} O (s) + 1.5 H_{2} O (l) \to {CaSO}_{4} . 2 H_{2} O (s) (Plaster of Paris) (Water) (Gypsum)$
In this reaction, a hard mass called gypsum is formed.

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Similar questions

(a) What is plaster of Paris? Write the chemical formula of plaster of Paris.

(b) How is plaster of Paris prepared? Write the chemical equation of the reaction involved.

(d) State two important uses of plaster of Paris.

(i) Write the chemical name and formula of "Plaster of Paris".

(ii) How is it prepared?

(iii) Write chemical equations of the reaction.

{CaSO}_{4} . \frac{1}{2} H_{2} O

C a S O_{4}

(C a S O_{4})_{2} . H_{2} O

C a S O_{4} .2 H_{2} O

2; 1 / 2

2; 5 / 2

1 / 2; 2

3 / 2; 1 / 2

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