To Prepare Methyl Orange from Sulphanilic Acid: Complete Guide

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APPARATUS REQUIRED:

1) Conical flask

2) Beaker

3) Filter paper

4) Thistle funnel

5) Testtube

6) Water bath

CHEMICAL REQUIRED:

1) Dimethyl aniline

2) Sodium carbonate

3) Sodium nitrite

4) Sulphanilic acid

5) Conc.HCL

6) Glacial acetic acid

THEORY:

Methyl orange is a light orange coloured solid soluble in alcohol. It is prepared as above by the diazotization. of sulphanilic acid followed by coupling with dimethyl aniline in presence of acid.

PROCEDURE:

0.5 gm sodium carbonate was dissolved in 20ml, water with 2gm sulphanilic acid. The solution was cooled in ice cold water & added a mixture of 1gm NaNO₂ & 2 ml of water. Then 2 ml of conc. HCL was added dropwise by maintaining temperature between 0-40°C, followed by a solution of 1 ml dimethyl aniline in 1 ml of glacial acetic acid. The solution was filtered and washed with water and dried, finally recrystallized in hot water & detected its melting point.

RESULT: 

Appearance: light orange crystal

M.P. : above 3000c.

CONCLUSION:

Hence, preparation of Methyl orange from sulphanilic acid was done in the laboratory.

PRECAUTION:

1) All the apparatus should be dried & cleaned before experiment.

2) Temperature must be maintained during the experiment as stated.

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