HINSBERG TEST

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procedure

sketch

conclusion

equipment

test tubes

droppers

water in a beaker

chemicals

1°, 2° and 3° amines

25% NaOH(aq)

distilled water

benzene sulphonyl chloride solution

concentrated HCl(aq)

1°, 2° and 3° amines in 3 test tubes

1) 25% NaOH(aq)

using a dropper add a small quantity of:

2) distilled water

3) benzene sulphonyl chloride solution

mix the solution

cool in a water bath

add a small quantity of HCl(aq) into each test tube

observations

test tube 1

after cooling: clear, colorless

test tube 2

after cooling: blurry, whitish

test tube 3

after cooling: white, opaque

after adding HCl: white, opaque

after adding HCl: unchanged

after adding HCl: clear, colorless

Secondary amine reacts with sodium hydroxide and benzene sulphonyl chloride to form insoluble sulphonamide. The insoluble sulphonamide formed in test tube B will not react with concentrated hydrochloric acid.

Tertiary amine will not react with benzene sulphonyl chloride, but it is insoluble in sodium hydroxide.The insoluble amine reacts with concentrated hydrochloric acid to form soluble ammonium salt.

Primary amine reacts with sodium hydroxide and benzene sulphonyl chloride to form soluble sulphonamide salt. Soluble sulphonamide salt will react with concentrated hydrochloric acid to form insoluble sulphonamide.

Darija Gazdek, 4.d