support@tutormate.in 022 6236 4602

Plaster of paris

Tutormate > CBSE Syllabus-Class 10th Chemistry > Plaster of paris

02 Acid, bases and salt

PLASTER OF PARIS (CALCIUM SULFATE HEMIHYDRATE)

Plaster of Paris is calcium sulphate hemihydrate (calcium sulphate half-hydrate).
The formula of plaster of Paris is
${CaSO}_{4} . \frac{1}{2} H_{2} O$

PREPARATION OF PLASTER OF PARIS

Plaster of Paris is prepared by heating gypsum
$({CaSO}_{4} . 2 H_{2} O)$
to a temperature of
$100^{°} C$
(373K).
When gypsum is heated to a temperature
$100^{°} C (373 K)$
of ,it loses three-fourths of its water of crystallisation and hence forms Plaster of Paris:

{CaSO}_{4} . 2 H_{2} O \to_{(373 k)}^{heat to 100^{\circ} c} {CaSO}_{4} . \frac{1}{2} H_{2} O + 1 \frac{1}{2} H_{2} O

PROPERTIES OF PLASTER OF PARIS

It sets into a hard mass on wetting with water or when exposed to mixture and allowed to dry.
It consists of fine white powder.

USES OF PLASTER OF PARIS

It is used in hospitals for setting fractured bones to ensure correct healing.
It is used in making toys, decorative materials, cheap ornaments, cosmetics, black-board chalk and casts for statues, due to its setting property.
It is used as a fire-proofing material.
It is used in chemistry laboratories for sealing air-gaps in apparatus where air-tight arrangement is required.

< Previous Chapter

Next Chapter >

Related Posts

Types of compounds acids II

Types of compounds acids

Types of compounds bases

Strength of acids and bases

pH scale

Indicators for testing acids and bases

Salts

Common salt

Sodium hydroxide

Washing soda

Baking soda

Bleaching powder

Hydrated salts

Baking powder

Start your learning Journey !

Tutormate-googleplay

Tutormate-AppleStore

Get SMS link to download the app