TESTS FOR GLYCEROL

TESTS FOR GLYCEROL:-

TEST SAMPLE:-10%AQUEOUS SOLUTION OF GLYCEROL.

1)ACROLEIN TEST:-
HEAT 2 DROPS OF UNDILUTED GLYCEROL WITH LITTLE SOLID POTASSIUM BISULPHATE (KHSO4) IN A DRY TEST TUBE CAUTIOUSLY AT FIRST AND THEN MORE STRONGLY.
NOTE THE PUNGENT ODOUR OF ACROLEIN.

2)DUNSTAN'S TEST:-
ADD DROP BY DROP ENOUGH OF 1% ALCOHOLIC SOLUTION OF PHENOLPHTHALEIN TO ABOUT 5ml OF  0.5% BORAX SOLUTION TO PRODUCE A DISTINCT RED COLOUR.
ADD 20% TEST (GLYCEROL) SOLUTION.
THE RED COLOUR IS DISCHARGED
HEAT THE SOLUTION AND THEN COOL.
THE RED COLOUR REAPPEARS ON HEATING ,BUT DISAPPEARS ON COOLING.
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