5 facts about Tollen's Test_(Tollens reagent+ Types of compound that gives Positive Tollen's Test)

Tollen's Test:

Preparation of Tollen's Reagent:

1 ml Silver nitrate solution is taken in a clean and dry test tube. To this, a drop of ammonium hydroxide solution is added. The precipitate is observed which is dissolved in excess ammonium hydroxide solution. The resultant clear solution is called Tollen's reagent.

Fact 1: Tollens Reagent is an ammoniacal solution of Silver nitrate

When an organic compound having -CHO is warmed with Tollen's reagent (an ammoniacal solution of silver nitrate), silver metal gets coated in the inner wall of the test tube. This reaction is called Tollen's test or silver mirror test.

Fact 2: Compound having CHO functional group particularly Aldehyde gives Tollens test so this test can be used as a Chemical test to distinguish aldehyde from ketone.

In this reaction, Aldehyde is oxidized to Carboxylic acid and     Tollens reagent gets reduced to metallic Silver.

   Fact 3: Tollen's test is the redox reaction.

Formic acid ( Which is the first member of Aliphatic Carboxylic acid), when warmed with Tollen's reagent, forms a silver mirror. Whereas other members of this family don't form such a silver mirror.

Fact 4: Tollen's test can be used to distinguish Formic acid (Methanoic acid) from the rest of the carboxylic acid.

Glucose is reducing sugar so forms silver mirror upon warming with Tollen's solution.

Fact 5: Tollen's test can be used to detect Glucose/ Sugar in Urine.

• Tweet
• Share
• Share
• Share
• Share

About MY CHEMISTRY TUTORIAL

This site provides notes on different chapters of Chemistry of Grade XI and XII (NEB Board). Also, it posts number of blogs on Collection of past questions and solution. Conversion chart, rules, Chemical test are some additional features.

Related Post