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Questions
Plaster of Paris should be stored in a moisture-proof container. Explain why?
Explain why plaster of Paris should be stored in a moisture-proof container.
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Solution
The Plaster of Paris should be stored in a moisture-proof container, as it absorbs moisture and turns into a hard substance (gypsum), as shown in the following chemical equation.
\[\ce{\underset{Plaster of Paris}{CaSO4 * 1/2 H2O} + 3/2 H2O -> \underset{Gypsum}{CaSO4 * 2H2O}}\]
RELATED QUESTIONS
Write an equation to show the reaction between plaster of Paris and water.
What will happen if heating is not controlled while preparing plaster of Paris?
What is gypsum?
Name the raw material used for the preparation of plaster of Paris.
How is plaster of Paris prepared? Write a chemical equation of the reaction involved.
State two important uses of plaster of Paris.
Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
- Identify the compound X.
- Write the chemical equation for its preparation.
- For what purpose is it used in hospitals?
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
How many molecules of water of crystallisation (per formula unit) are present in:
Gypsum
The chemical formula for plaster of Paris is:
At what temperature is gypsum heated to form Plaster of Paris?
How many water molecules does hydrated calcium sulphate contain?
______ is used in making blackboard chalks.
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:
______: Calcium Sulphate Dihydrate:: Plaster of Paris: Calcium Sulphate Hemihvdrate.
