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Questions
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
FeCl3
Write a balanced equation for this reaction.
Give the reactions to explain what happens when ammonia solution is added drop by drop till it is in excess to the following solution:
FeCl3
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Solution
Adding ammonium hydroxide drop by drop to iron(III) chloride solution forms a reddish-brown precipitate of iron(III) hydroxide.
\[\ce{\underset{(Yellow solution)}{FeCl3} + 3NH4OH -> \underset{Ferric hydroxide}{\underset{(Reddish brown ppt.)}{Fe[OH]3\downarrow}}+ \underset{(Colourless solution)}{3NH4Cl}}\]
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|
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| To Solution X, ammonium hydroxide is added in minium quantity first and then in excess | A dirty white precipitate is formed which dissolves in excess to form a clear solution | (i) |
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| To solution W, A small quantity of sodium hydroxide solution is added and then in excess | A white precipitate is formed which remains insoluble | (iii) |
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