Question

) Explain two sources of error that may occur during the filtration process. For each source of error, explain how this error would affect the values of the mass % for each component. (Would the mass % be larger or smaller than the correct value?

Answer 1

small volume of liquid left in beaker or filter paper

Explanation:

Filter paper (if that's what you used) "traps" and could have evaporated some fluid in it. So not all your fluid was collected in the filtrate which means the mass would be smaller.
You could also argue that when tilting the beaker, there's always those tiny little droplets left behind in the beaker since they stick to the wallls, which reduces the volume(and mass) of water you collected