Pure de-mineralised water can be obtained by

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) To obtain de-mineralised water (also known as de-ionized water),all dissolved mineral salts must be removed. This is achieved by passing water thr

Vedclass · Accepted Answer

$H^{+}$ cation exchanger and $OH^{-}$ anion exchanger

Vedclass · Answer

(C) To obtain de-mineralised water (also known as de-ionized water),all dissolved mineral salts must be removed. This is achieved by passing water through an ion-exchange resin system. First,the water passes through a cation exchange resin in the $H^{+}$ form,which replaces all metal cations (like $Ca^{2+}$,$Mg^{2+}$,$Na^{+}$) with $H^{+}$ ions. Second,the water passes through an anion exchange resin in the $OH^{-}$ form,which replaces all anions (like $Cl^{-}$,$SO_4^{2-}$,$HCO_3^{-}$) with $OH^{-}$ ions. The released $H^{+}$ and $OH^{-}$ ions combine to form water $(H^{+} + OH^{-} \rightarrow H_2O)$. Therefore,the correct method uses both $H^{+}$ cation exchanger and $OH^{-}$ anion exchanger.

Similar Questions

Which one of the following is called an amphoteric solvent?

Observe the following statements:
$1.$ Heavy water is harmful for the growth of animals.
$2.$ Heavy water reacts with $Al_4C_3$ and forms $\text{deuterated acetylene}$.
$3.$ $BaCl_2 \cdot 2D_2O$ is an example of $\text{interstitial deuterate}$.
The correct statements are:

The products formed when heavy water is reacted with magnesium nitride are:

Give reasons.
$(i)$ Lakes freeze from top towards bottom.
$(ii)$ Ice floats on water.

Vedclass Test Series

Exam Paper Generator

Online Exam Module