Liquid Ammonia Purity

Care should be taken while handling liquid Ammonia.This is a simple experiment.In the lab students should open the bottle of Ammonia  under the guidance of a teacher.
When I was at Rubber Research Institute Of India, I got the opportunity to test the purity of liquid Ammonia.

Lets go to the experiment.

 APPARATUS:

Electronic balance,50ml Erlenmeyer flask, 500ml beaker, burette, glass rod.

REAGENTS:

Distilled water,methyl red indicator,1N HCl

PROCEDURE:

• Transfer 20- 25ml liquid ammonia to a 50ml erlenmeyer flask provided with a stopper.

• Take 300ml distilled water in a 500ml beaker.

• Weigh 1-2 gm of liquid Ammonia from erlenmeyer flask using the electronic balance.

• Note the weight.
• The above weight of liquid Ammonia is added to 300ml distilled water taken in 500ml beaker.(already mentioned)
• This step should be immediately done.
• Add 1 drop of methyl red indicator to the beaker.
• Titrate against 1N HCl taken in the burette.

• Stirr the contents in the beaker using a glass rod  while the titration is done.

• At the endpoint a pink color is obtained.

CALCULATION:

  From the normality of HCl, volume of HCl & the weight of the sample taken , the purity of liquid Ammonia can be calculated