Question

Ferric hydroxide sol get squad related on addition of sodium chloride

Answer 1

(ii) An electrolyte, NaCl is added to hydrated ferric oxide sol. ... (ii) When NaCl is added to ferric oxide sol, it dissociates to give Na+ and Cl- ions. Particles of ferric oxide sol are positively charged. Thus, they get coagulated in the presence of negatively charged Cl- ions.

Answer 2

Answers : (1)

(a)The reaction forms an insoluble preceiptate of ferric chloride FeCl3 (s). The net reaction can be shown as:
Fe3+(aq) + 3CL-(aq) ----> FeCl3(s)
(b)to get free of charged particle we are using cottrell’s smoke precipitator as the smoke coming out of chimney has charged particle of carbon so to neutralise it a oppositely charged plate called cottrells smoke precipitator is used
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