Hardness of water can be removed by :

adding calcium hydroxide

No worries! We‘ve got your back. Try BYJU‘S free classes today!

ion-exchange method

No worries! We‘ve got your back. Try BYJU‘S free classes today!

both a and b

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

none of above

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C both a and b
Hardness of water can be removed by the following two methods:
CLARK'S METHOD
In Clarks method a calculated amount of calcium hydroxide $C a (O H)_{2}$ is added to hard water. Due to reaction, insoluble carbonates are obtained which are separated by filtration.
$C a (H C O_{3})_{2} + C a (O H)_{2} 2 C a C O_{3} + 2 H_{2} O$
$M g (H C O_{3})_{2} + C a (O H)_{2} C a C O_{3} + M g C O_{3} + 2 H_{2} O$
ION-EXCHANGE METHOD
In this method sodium zeolite is used as ion-exchanger. Na-zeolite is passed through the pipes containing hard water. Sodium zeolite is converted into calcium-zeolite or magnesium-zeolite. These are insoluble in water and are separated from water by filtration.
$C a + 2 + N a 2 - z e o l i t e C a - z e o l i t e + 2 N a + 1$
$M g + 2 + N a 2 - z e o l i t e M g - z e o l i t e + 2 N a + 1$

Suggest Corrections

Similar questions

(N a P O_{3})_{6}

Which type of hardness can be removed by adding washing soda to hard water? Explain your answer.

Join BYJU'S Learning Program