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Questions
Distinguish between the following (using ammonia solution):
Ferric salt and ferrous salt
Give a chemical test to distinguish between ferrous and ferric salt.
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Solution
Ammonium hydroxide is added dropwise to the solution to be tested.
Ferrous salt gives a dirty green ppt.
Ferric salt gives a reddish-brown ppt of their hydroxides.
\[\ce{FeSO4 + 2NH4OH -> (NH4)2SO4 + Fe(OH)2↓}\]
\[\ce{Fe2(SO4)3 + 6NH4OH -> 3(NH4)2SO4 + 2Fe(OH)3↓}\]
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