Using a gas syringe
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when can gas syringes 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
what does the volume of a gas depend on
the pressure and temperature so when recording volume it is important to note down the temperature and pressure of the room
what are 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
what’s the method for using a gas syringe to calculate the Mr of propanone
1) extract 0.2cm3 of propanone into a hypodermic syringe and then measure the mass of this syringe 2) using hand protection , remove a gas syringe from the oven and note the volume of air already in the barrel - about 5cm3 3) inject the propanone through the self seal cap into the barrel. The plunger will move straight away . 4) put the gas syringe back into the oven 5) measure the mass of the empty hypodermic syringe immediately 6) after a few minutes measure the volume of the gas in the gas syringe , record the temperature of the oven shelf and the pressure of the room