Question

What are the advantages of using ion-exchange resins over zeolites for the
removal of hardness in water? Explain in detail.

Answer 1

Answer:

-More efficient as it can exchange only cations.

-Less efficient as the resins cannot be regenerated.

-More efficient as it can exchange both cations as well as anions.

-Less efficient as it can exchange only anions.

Answer 2

1.on exchange resins are useful for the removal of water problems including hard water, scale buildup, nitrates and arsenic. Ion exchange resins are useful for the removal of water problems including hard water, scale buildup, nitrates, arsenic and more

2.More efficient as it can exchange only cations and less efficient as the resins cannot be regenerated.

3.More efficient as it can exchange both cations as well as anions.Less efficient as it can exchange only anions

Explanation:

1.The zeolite process and the synthetic resins method for the removal of permanent hardness.

2.Zeolite process

It removes only the cations responsible for permanent hardness.

The reaction is as given below –

2NaZ+M2+(aq)→MZ2(s)+2Na+(aq)

;(M – Mg, Ca)

3.Synthetic resins method

It removes the cations, as well as the anions responsible for permanent hardness.

The reaction is as given below –

For cations

2RNa(s)+M2+(aq)→R2M(s)+2Na+(aq)

;(M – Mg, Ca)

For anions

RNH+3OH−(s)+X−(aq)→RNH+3X−(s)+OH−(aq)

;(X – anions – Chloride, sulphate, etc.)

4.The difference between the zeolite and ion exchange process is that the zeolite process uses the mineral zeolite as the exchanging resin for cations in the hard water whereas the ion exchange process include several different resins for the ion exchange.

5. Synthetic resins method is more efficient as it can exchange both cations as well as anions.