Question

Calgon's method removes permanent hardness of water, chemically calgon is

Answer 1

bleaching powders is the correct answer

Answer 2

Hey brainly user!

Here is your answer

________________________________

Soft water:

The water which gives lather readily with soap solution is called as the soft water.

Hard water :

The water which doesn't give lather readily with soap water is called as the hard water.

Bicarbontes, calcium, chlorides, sulphates of magnesium causes the hardness of water

Calgon :

Sodium Meta hexa phosphate

Formula:

$\bold{Na_2[Na_4[PO_3]_6]}$

When hard water is passed over the calgon then the following reactions takes place and then magnesium and chlorine are removed

$\bold{2MgCl_2+Na_2[Na_4[PO_3]_6]{\rightarrow}Na_2[Mg_2[PO_3]_6]+4NaCl}$