Question

When zeolite is treated with hard water; there is exchange reaction between calcium/magnesium ion/and...........

• A. aluminium ion.
• B. sodium ion.
• C. water of hydration.
• D. sulphate ion.

Answer 1

The correct option is B sodium ion.

Sodium zeolite softening is the most widely applied use of ion exchange.

In zeolite softening, water containing scale-forming ions, such as calcium and magnesium, passes through a resin bed containing SAC resin in the sodium form. In the resin, the hardness of ions are exchanged with the sodium, and the sodium diffuses into the bulk water solution.