First slide

Hardness of water

Question

Which will produce hard water ?

Easy

A

Saturation of water with CaSO₄
B

Addition of Na₂SO₄to water
C

Saturation of water with CaCO₃
D

Saturation of water with MgCO₃

Solution

(1) Presence of Chlorides and sulphates of Ca and Mg causes permanent hardness.
(2) Presence of bicarbonates of ca and Mg causes temporary hardness.

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