Give the chemical equations and observations of the following reactions :
1.sodium hydroxide reacts with ferric sulphate
2.sodium hydroxide reacts with ferrous sulphate, ferric chloride and ferric sulphate in excess
3.ammonium hydroxide reacts with ferrous sulphate, ferric chloride and ferric sulphate in excess
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1. Ferric sulphate gives brown ppt of Fe3+
The chemical reaction will be given as:
Fe 2 (SO4 )3 (aq) + 6NaOH(aq) →2Fe(OH)3 (ppt)+3Na2 SO4 (aq)
2. Ferrous sulphate gives pale green ppt Fe2+
The chemical reaction will be given as:
FeSo4 + 2NaOH ➡️ Fe(OH)2 (ppt)+ Na2SO4
3. Ferrous sulphate solution is treated with ammonium hydroxide solution.
FeSO4 + NH40H ➡️ Fe(OH)2 + NH4 SO4 [2*5=10]
When ammonium hydroxide is added to solution of ferric chloride then it results in the formation of ferric hydroxide and ammonium chloride.
FeCl3 + 3NH4OH ➡️ Fe(OH)3 + 3NH4Cl
A reddish brown precipitate is observed and Fe(OH)3 is insoluble in excess aq. ammonia / ammonium hydroxide.
FeSO4 + 2NH4OH ➡️ (NH4)2 SO4 + Fe(OH)2
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