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Common ways of making Ammonia in the lab ?

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Original post by Ari Ben Canaan
One other question.

During a chemistry practical I have noticed that in some tests that I observe fizzing upon adding HCl.

Usually this means the presence of a carbonate ion.

However, the examiner's report often states that it is necessary to test the evolved gas with limewater.

How would I do this ? Usually I am carrying the test out in a small test tube and I am never provided with a gas syringe, connecting tubes or other apparatus.

So it is a logistics issue of getting the gas into a small amount of limewater.


There is a method that is often used and quite successful if done carefully.

Limewater in a test tube 1/3 full.

Squeeze a dropping pipette and hold it shut.
Hold it in the suspected CO2 gas (taking care not to touch the liquid)
Release the bulb.

[cycle starts here]
Remove the pipette and put it into the limewater.
Squeeze to expel the gas (do not release the bulb)
Place into the suspected CO2 once again.
Release the bulb.
[end cycle]

Repeat cycles until a change is noted in the limewater.
Isn't the Haber process the production of ammonia from nitrogen and hydrogen gasses?

:rolleyes:
Original post by charco
There is a method that is often used and quite successful if done carefully.

Limewater in a test tube 1/3 full.

Squeeze a dropping pipette and hold it shut.
Hold it in the suspected CO2 gas (taking care not to touch the liquid)
Release the bulb.

[cycle starts here]
Remove the pipette and put it into the limewater.
Squeeze to expel the gas (do not release the bulb)
Place into the suspected CO2 once again.
Release the bulb.
[end cycle]

Repeat cycles until a change is noted in the limewater.


So you are saying that I should basically 'suck-up' some of the evolved gas with a pipette and release it into some limewater ?
Original post by Ari Ben Canaan
So you are saying that I should basically 'suck-up' some of the evolved gas with a pipette and release it into some limewater ?


That's about the gist of it :smile:

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