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Temporary har...

Question

Temporary hardness can be removed by mixing water with slaked lime, this process is known as ________.

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Solution

Temporary hardness can be removed by mixing water with slaked lime, this process is known as softening.

Slaked lime removes hydrogencarbonates:

$C a (O H)_{2} + C a (H C O_{3})_{2} \to 2 C a C O_{3} (p r e c i p i t a t e) + 2 H_{2} O$

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Temporary hardness can be removed by mixing water with slaked lime, this process is known as softening of water.

Fill the following crossword using the following statements:

ACROSS
3 The chief dissolved salt present in seawater
4 The process by which temporary hardness removed by mixing water with slaked lime
7 An artificial zeolite
8 Sodium hexa meta phosphate
9 Universal solvent
DOWN
1 Water which is free from all the dissolved salts and impurities
2 The hardness that can be removed by heating with washing soda
3 The process by which hardness of water is removed making the water soft
5 The hardness that can be removed by boiling
6 Water which occurs in a free state, in nature

Temporary hardness can be removed by which of the following process?

Q. Assertion :Temporary hardness can be removed by addition of lime. Reason:

C a (H C O_{3})_{2}

in hard water is converted to insoluble

C a C O_{3}

on moderate heating.

Temporary hardness of water can be removed by

(a) filtering

(b) boiling

(c) loading

(d) none of the above

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