Question

Why is Fe(OH)3 colloid positively charged, when prepared by adding FeCl3 to
hot water?


NCERT Class XII
Chemistry - Exemplar Problems

Chapter 5. Surface Chemistry

Answer 1

because adsorption of positively charged Fe 3+  IONS takes place by the sol of hydrated ferric oxide.

Answer 2

$Fe(OH)_3$ colloid positively charged, when prepared by adding$FeCl_3$ to

hot water:

• When $FeCl_3$ is with a large quantity of$H_2O$ ( water ) then it will proceed to prepare a sol -$Fe(OH)_3$  where the $Fe3^+$ ions are present in an excess amount which are also common to lattice of the sol.

• Therefore, it will be adsorbed on the sol by giving the sol an overall positive charge.

• So we can say that adsorption of the positively charged $Fe3^+$ ions by the sol of hydrated ferric oxide gives a final result of colloid which have an overall positive charge.

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