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.
