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Topic: qualitative analysis  (Read 4959 times)

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Offline arvind1990

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qualitative analysis
« on: May 26, 2006, 10:27:26 AM »

            How can we say the product by viewing the precipitate obtained.
Can anyone list out the products(or compounds) with their colours .
For eg,
A colourless soln(aq) on adding water and on heating gave white ppt.This ppt when further reacts with NH4Cl and NH4OH in excess resulted in dissolution of some of ppt and a gelatinous ppt is obtained.What is the hydroxide formed in aq.soln??
Can anyone say how to approach these sums in an easier way???
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Offline Albert

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Re: qualitative analysis
« Reply #1 on: May 26, 2006, 03:19:07 PM »
Well, at first sight, I remember aluminium to form a gel-like precipitate when you add NH4Cl and NH4OH (pH 9, I think).

However, I don't think this to be consistent with what you say about a precipitate formed just by heating an aqueous solution.
« Last Edit: May 26, 2006, 03:24:58 PM by Albert »
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Offline Alberto_Kravina

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Re: qualitative analysis
« Reply #2 on: May 30, 2006, 08:20:49 AM »
Magnesium hydroxide looks pretty similar to Aluminuim hydroxide. It´s also a gelatinous ppt.
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