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GIVE a chemical test to distinguish between formic acid and acetic acid

GIVE a chemical test to distinguish between formic acid and acetic acid


 

Grade:12

3 Answers

Kamlesh Kumar
askIITians Faculty 60 Points
7 years ago
HCOOH REACTS WITH TOLLENS REAGENT [ AMMONICAL SILVER NITRATE] ,SILVER MIRROR IS FORMED WHILE CH3COOH DOES NOT REACTS WITH TOLLENS REAGENT.



thanks & regards
Kamlesh kumar
askIITians faculty
Sakthi Ganesh
24 Points
7 years ago
Test 1: To distinguish between formic acid and acetic acid use tollens(tollens reagent = ammonical silver nitrate solution) test(silver mirror) or fehling solution . Formic acid gives positive indicated by the formation of a silver mirror( Silver oxide precipitate on the walls of the test tube) test but acetic acid fails to form a silver mirror. This is because the formic acid behaves as an aldehyde as there is a CHO group the other side of the OH group and it is easily oxidised to CO2. Test 2: Take 3 drops of both the formic acid and acetic acid in 2 different test tubes, add 1 ml of distilled water, & 1-2 drops of dilute KMnO4 solution - the formic acid instantly decolorises pink color of KMnO4, while acetic acid does not. Regards, Sakthi Ganesh IIT JEE Aspirant (IIT JEE 2014)
Yash Chourasiya
askIITians Faculty 256 Points
10 months ago
Dear Student

1. By using tollens test (Silver Mirror Test) or fehling solution .

2. By using Acidified KMnO4.

I hope this answer will help you.
Thanks & Regards
Yash Chourasiya

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