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Hardness of Water:Causes, Types and Treatments

Question

Temporary hardness is caused due to the presence of :
$C a {C l}_{2}$
$C a C O_{3}$
$C a S O_{4}$
$C a {(H C O_{3})}_{2}$

A

C a C O_{3}

B

C a S O_{4}

C

C a {C l}_{2}

D

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

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Solution

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Temporary hardness is due to the presence of bicarbonates of $M g$ and $C a$ .

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Similar Questions

Q1

Temporary hardness is caused due to the presence of:

View Solution

Q2

10

L of hard water with temporary hardness of

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

requires

0.56

g of lime. The reaction follows as:

C a (H C O_{3})_{2} + C a O ⟶ 2 C a C O_{3} + H_{2} O

.
Temporary hardness in terms of ppm of

C a C O_{3}

is:

View Solution

Q3

Temporary hardness is due to

H C O_{3}^{-}

of

M g^{2 +}

and

C a^{2 +}

. It is removed by addition of

C a O

.

C a (H C O_{3})_{2} + C a O ⟶ 2 C a C O_{3} + H_{2} O

Mass of

C a O

required to precipitate

2

g

C a C O_{3}

is :

View Solution

Q4

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.

View Solution

Q5

Temporary hardness is due to bicarbonates of

M g^{2 +} a n d C a^{2 +}

, it is removed by addition of CaO as follows:

C a (H C O_{3})_{2} + C a O \to 2 C a C O_{3} + H_{2} O

Mass of

C a O

required to precipitate 2 g

C a C O_{3}

is:

View Solution