Question

Zeolite cannot be regenerated, if water contains A: Ca+2 ions B: Both Ca+2 and Mg+2 ions C: Mg+2 ich D: Fe +2 and Mn+2 ions​

Answer 1

Answer:

Permutit is an artificial zeolite. It is sodium aluminium orthosilicate

Na2 Al2 Si 2 O8 .xH2O.

Na2 Al2 Si2 O8 .xH2O+Ca2+ (orMg2+)→

permutit

CaAl2 Si2 O8 .xH2 O+2Na +

exhausted permutit

Answer 2

Answer:

The zeolite cannot be regenerated if the water contains $Ca^{2+}$ and $Mg^{2+}$.

Therefore, option b) Both $Ca^{2+}$ and $Mg^{2+}$ions are correct.

Explanation:

Zeolites are hydrated aluminosilicates.

For example, Permutit is a synthetic zeolite ( $Na_{2} Al_{2}Si_{2}O_{8}.xH_{2} O$ ).

• The common name is sodium aluminium orthosilicate.
• Zeolites are used in water softening by removing the hard water impurities in the form of cations.
• They act as base exchangers in contact with the water cations and can remove $Ca^{2+}$ and $Mg^{2+}$ ions from the hard water.

When the hard water contains $Ca^{2+}$ and $Mg^{2+}$ passes through the zeolite, the zeolite gets inactive and cannot be regenerated.

• $Na_{2} Al_{2}Si_{2}O_{8}.xH_{2} O + Ca^{2+}/Mg^{2+} \rightarrow Ca Al_{2}Si_{2}O_{8}.xH_{2} O + 2Na^{+}$
•     Active zeolite                                   Inactive zeolite

Hence, if the water contains $Ca^{2+}$ and $Mg^{2+}$cannot be regenerated.