Gas Syringe Use
A gas syringe can be used to measure gaseous products from a reaction.
When using a gas syringe to measure gases it is important to keep the syringe free from liquids. As gases can dissolve in liquids, especially under any resulting pressure, this may result in inaccurate measurements (Henry's law).
The amount of gas in moles formed in a reaction can be measured by measuring the volume of gas evolved at standard (or known) pressure conditions (gas law, PV=nRT).
Accordingly, it is important that the syringe barrel should move freely within the syringe chamber, if one assumes that the measured gas is at standard temperature and pressure. Any friction would result in a pressure build-up in the syringe and would lead to an inaccurate measurement, that is, a lower amount of gas would be determined, than really obtained.
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