Uses and Tests of Ammonia
Ammonia is a nitrogen hydride which can be identified through various tests.
Mostly three types of tests are performed
First one among them is odour test
Ammonia is a colourless gas with a characteristic pungent smell.. But this alone cannot give us an idea about its presence.So, we should go for other tests.
Second test is the litmus test
Ammonia has one lone pair of electrons which can be donated. So it acts as a lewis base.
Since ammonia is a lewis base, It turns red litmus to blue and helps us in identifying the compound.
Third type of test is precipitation reaction
Ammonia dissolves in water to form ammonium hydroxide which is a weak base.
Ammonium hydroxide precipitates certain heavy metal ions like
from their aqueous salt solutions.
It gives different coloured precipitates as we can see from the reactions. Hence, we can easily find the presence of ammonia by above tests.
Let us go on to look at some of the uses of the compound: ammonia.
It is used in the manufacture of many nitrogenous fertilisers e.g; ammonium sulphate,ammonium phosphate.
It is also used in the manufacture of many inorganic nitrogen compounds like nitric acid.
Liquid Ammonia is used as a refrigerant in ice plants.
It is also used as a cleansing agent in the manufacture of artificial silk.
Apart from that, it is also used in the manufacture of sodium bicarbonate by the solvay’s process.
NOW LET US RECALL WHATEVER WE HAVE LEARNT ABOUT AMMONIA:
Ammonia is an important compound which has wide range of applications.
We have basically three tests to find the presence of ammonia in a particular compound: odour,litmus and precipitation reactions.
It has a pungent smell and it turns red litmus to blue as it is a base.It precipitates heavy metal ions from their aqueous solutions.
It gives many coloured precipitates which enable us to find the presence of ammonia in that compound.
It has many applications in everyday life. It is used to manufacture many fertilisers and many inorganic compounds like nitric acid.
It is also used as a cleansing agent in dry cleaning. It is also used as a refrigerant.