Fundamental Organic Chemistry
Fundamental Organic Chemistry
Fundamental Organic Chemistry
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Third: test of dye formation<br />
Take 3 test tube<br />
Tube (1): 1ml of aniline + 3.5 of conc. HCl<br />
Tube (2): 1ml of sodium nitrite NaNO 2<br />
Tube (3): β-naphthol dissolved in NaOH.<br />
Then Put 3 test tube in ice bath & Put tube (2)<br />
mixture on tube (3)<br />
(1) slowly, then add<br />
No dye formed<br />
Go to the fourth step<br />
Red dye formed unknown<br />
is aniline hydrochloride or<br />
aniline sulfides<br />
Forth: 1ml of N.S. of acid + drops of FeCl 3<br />
-ve unknown is oxalic<br />
or tartaric or citric acid<br />
Violet color unknown<br />
is salicylic acid<br />
Buff ppt. unknown<br />
is Benzoic acid<br />
1ml of N.S. of acid + 1ml of CaCl 2<br />
White ppt. after boiling<br />
unknown is citric acid<br />
White ppt. after scratching<br />
the inner wall of the tube<br />
unknown is Tartaric acid<br />
White ppt. on cold<br />
unknown is Oxalic acid<br />
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