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Ammonium carbamate dissociation - why was the isoteniscope U-tube filled with mercury?

On investigation of the thermodynamics of ammonium carbamate dissociation:

NH2COONH4 (s) <--> 2NH3 (g) + CO2 (g)

Equipment used was ballast chamber, Pressure Gauge, cold trap, stirrer, water bath, isoteniscope, vacuum line etc...

Why did we fill the U-tube with mercury and not ammonium carbamate?

Thank you in advance.

Lancenigo di Villorba (TV), Italy

You described a chemical reaction

NH2COONH4 (s) <--> 2NH3 (g) + CO2 (g)

which results a dissociation.
On the other hand, a solid stuff gives several gas products : so, in a closed vessel you have to attempt a pressure increasing since it gives gas moles.
If you connected the U-type (e.g. Isoteniscopic) tube to the closed chamber, you have to record pressure increasing.
An italian scientist (E. Torricelli, XVII century) introduced the glass-pipe filled by liquid mercury : since it is a very heavy liquid, it results very valuable to measure pressure's exchange.
Going back to your experiment, you will see a rising of the mercury inside the U-pipe since the inner pressure in the vessel rises owing to Ammonia and Carbon Dioxide's forming (e.g. NH3 and CO2).

I hope this helps you.

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