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MJLPHD

Lavoisier's methods to make nitrogen

29/10/2013

3 Comments

 
Picture
Ever been frustrated by impure nitrogen? Imagine how Lavoisier felt. He had to discover nitrogen and then make his own. I've pulled this snippet from page 169 of his book (which was translated into English during his lifetime by his contemporaries). Additions by me are in brackets:

"The azotic gas (N2) may be procured from atmospheric air, by absorbing the oxygen gas which is mixed with it by means of a solution of sulphuret of potash (K2S), or sulphuret of lime (CaS). It requires twelve or fifteen days to complete this process, during which time the surface in contact must be frequently renewed by agitation, and by breaking the pellicle which forms on the top of the solution. It may likewise be procured by dissolving animal substances in dilute nitric acid very little heated. In this operation, the azote is disengaged in form of gas, which we receive under bell glasses filled with water in the pneumato-chemical apparatus. We may procure this gas by deflagrating nitre with charcoal, or any other combustible substance; when with charcoal, the azotic gas is mixed with carbonic acid gas (CO2), which may be absorbed by a solution of caustic alkali, or by lime water, after which the azotic gas remains pure. We can procure it in a fourth manner from combinations of ammoniac (NH3) with metal oxyds, as pointed out by Mr de Fourcroy: The hydrogen of the ammoniac combines with the oxygen of the oxyd, and forms water, whilst the azote being left free escapes in form of gas."

3 Comments
Peter McKay
30/10/2013 01:46:34 am

He'd done quite a lot of work! Considering that he always had many other duties, his powers of work must have been formidable.

A small correction: 'sulphuret of potash' is potassium sulphide, not sulphate, and similarly 'sulphuret of lime' is calcium sulphide. Sulphates wouldn't absorb oxygen.

Reply
Matthew Leonard link
30/10/2013 02:24:38 am

Yes, you're right Peter. Thanks for your input. :-)

Reply
Matthew Leonard
1/11/2013 06:15:31 pm

It is now corrected.


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