IDENTIFICATION TEST FOR ANIONS

IDENTIFICATION TEST FOR ANIONS

ACETATE ION       

             

1.     Adding oxalic acid to a concentrated sodium acetate solution produces acetic acid, which emits a strong smell of vinegar.

Acetate Oxalic acid acetic acid sodium Acetate

2.                When a drop of concentrated sulphuric acid and ethanol are added, the distinctive smell of an ester can be observed. This applies  to all carboxylates, but is particularly useful in this case because the two reactants, acetic acid and ethanol, have distinctive smells which are replaced completely by different smellof the ester; in this case, ethyl acetate, which smells not unlike glue or nail polish remover.

3.                To 3 ml of water/soda extract 0.25 ml lithium nitrate solution and 0.1ml of o.1N potassium iodide solution were added. After this, few drops of dilute ammonia solution was added and the resultant solution was heated. within a few minute blue colour is obtained.

4.                Equal volume of soda/water extract and pure calcium hydroxide is taken in a test tube. Heat the solution and pass the evolved vapours into a solution of 2,4 DNP hydrazine.