Using a gas syringe If drawing a gas syringe make sure you draw it with some measurement markings on the barrel to show measurements can be made. The volume of a gas depends on pressure and temperature so when recording volume it is important to note down the temperature and pressure of the room. Make sure you don’t leave gaps in your diagram where gas could escape Gas syringes can be used for a variety of experiments where the volume of a gas is measured, possibly to work out moles of gas or to follow reaction rates. Moles of gas can be calculated from gas volume (and temperature and pressure) using ideal gas equation PV = nRT. Potential errors in using a gas syringe •gas escapes before bung inserted •syringe sticks • some gases like carbon dioxide or sulphur dioxide are soluble in water so the true amount of gas is not measured.
2.1.3 Amount of substance
Percentage yields and atom economy
(i) the techniques and procedures required during experiments requiring the measurement of mass, volumes of solutions and gas volumes