What is involved in the collection of gas by water displacement, and why is it important that the water level inside and outside the gas collection tube are the same before the volume measurements are taken?
Answers
Answer:
For gases that is ain't particularly soluble in water, its possible to collect the evolved gas by displacement of water (H2O) from a container.
The gas is collected in the container and the pressure of the gas pushes the water out of the container. The volume of the gas can determined, which is the amount of water being displaced. Water displacement by gas can only occur with gas that is insoluble in water.
The level of water is adjusted so that the pressure of the container is the same inside and outside, because by knowing the pressure of the surroundings (atmospheric pressure),
then the pressure inside can be determined as well. It is important to be able to get the number of moles of gas involved by using the ideal gas law.
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