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Question
Plaster of Paris should be stored in a moisture-proof container. Explain why?
Solution
The Plaster of Paris should be stored in a moisture-proof container, as it absorbs moisture and turns into hard substance (Gypsum) as shown in following chemical equation.
\[\ce{\underset{Plaster of Paris}{CaSO4. 1/2 H2O} + 3/2 H2O -> \underset{Gypsum}{CaSO4.}2H2O}\]
RELATED QUESTIONS
What is the commercial name of calcium sulphate hemihydrate?
What will happen if heating is not controlled while preparing plaster of Paris?
Plaster of Paris has a remarkable property of setting into a hard mass on addition of water.
What is gypsum? What happens when gypsum is heated to 100°C (373 K)?
What is plaster of Paris? Write the chemical formula of plaster of Paris.
State two important use of plaster of Paris.
Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:
(a) CaSO3.2H2O
(b) CaCl2.2H2O
(c) CaCO3.2H2O
(d) CaSO4.2H2O
Consider the following substances:
NaCl, Ca(OH)2, NaHCO3, NH3, Na2CO3, H2O, Cl2, CO2, CaSO4.2H2O, 2CaSO4.H2O, CaOCl2
Which compound represents plaster of Paris?
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
Write the chemical equation for its preparation
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
For what purpose is it used in hospitals?
How many molecules of water of crystallisation (per formula unit) are present in:
gypsum?
How are detergents manufactured?
How many water molecules does hydrated calcium sulphate contain?
______ is an important material in the construction industry.
Match the Following:
| 1. | Antiseptic | a. | Plaster of paris |
| 2. | Making casts for statues | b. | Phenol |
| 3. | Ease stress and relaxes | c. | Gypsum |
| 4. | Fertilizers | d. | Epsum |
Analogy:
Blackboard chalks: ______:: Plant growth: Epsum.
Analogy:
______: Calcium Sulphate Dihydrate:: Plaster of Paris: Calcium Sulphate Hemihvdrate.
A compound which is prepared from gypsum has the property of hardening when mixed with water. identify the compound and write its formula. How is this compound prepared? Describe it in the form of a chemical equation only.
