1.

Explain the function of permutit in the softening of hard water.

Answer»

Solution :(i) Permutit is EMPLOYED for softening of hard water. It adsorbs `Ca^(2+) and Mg^(2+)`ions in its surface, there is an ION exchange as shown below it occurs on the surface.
`underset("Permutit")(Na_2Al_2Si_4O_(12))+CaCl_2 to CaAl_2 Si_4O_(12) + 2NaCl`
(ii) EXHAUSTED permutit is GENERATED by adding a solution of commonsalt.
`underset("Permutit")(CaAl_2Si_4O_(12))+ 2NaCl to Na_2Al_2Si_4O_(12)+CaCl_2`


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