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Crystals of Salts

Question

The number of molecules of water of crystallization present in one molecule of ferrous sulfate is_______.
$5$
$7$
$6$
$10$

A

5

B

7

C

6

D

10

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Solution

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When water is used in the formation of crystals knows as water of crystallization.
The water of crystallization is the total weight of water in a substance at a given temperature and is mostly present in a definite ratio.
On heating, iron(II) sulfate first loses its water of crystallization and the original green crystals are converted into a brown-colored anhydrous solid.
$F e S O_{4} .7 H_{2} O$ is the heptahydrate in solution (water as solvent) transforms to both heptahydrate and tetrahydrate when the temperature reaches ${56.6}^{\circ} C$ .
Hence, option $B$ is correct.

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Q1

The number of molecules of water of crystallization present in one molecule of ferrous sulfate is_______.

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Q2

The number of water of crystallization molecules present in one molecule of plaster of Paris is:

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Q3

Hydrated Calcium Sulfate

[C a S O_{4} . x H_{2} O]

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Q5

Copper sulphate crystals which seem to be dry contain water of crystallization. When we heat the crystals, this water is removed and the salt turns white. If you moisten the crystals again with water, you will find that blue colour of the crystals reappears.

The water of crystallization is the fixed number of water molecules present in one formula unit of a salt. Five water molecules are present in one formula unit of copper sulphate. The chemical formula for hydrated copper sulphate is

C u {S O}_{4}

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5 H_{2} O

. Now you would be able to answer the question whether the molecule of

{N a}_{2} {C O}_{3}

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10 H_{2} O

is wet. One other salt, which possesses water of crystallization is gypsum. It has two water molecules as a water of crystallization. It has the formula

C a {S O}_{4}

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