physical separation techniques can only be used to separate mixtures
define filtration?
used to separate an insoluble solid from a liquid
what does insoluble mean?
solid will not dissolve in the liquid
how does filtration work?
pour the mixture into the filter paper
the liquid passes through the tiny pores in the filter paper
solid material cant pass through the filter paper so it's trapped
what is crystallisation?
separates a soluble solid from a liquid
what is soluble?
solid can be dissolved
leaving the soluble solution for a few days, it will evaporate forming crystals and will turn from an aqueous (water) solution to a solid
how to make crystallisation more faster?
by heating the solution to evaporate the water - be careful= certain chemicals will break down with heat so its sometimes better to let water evaporate on its own
how does crystalisation work?
a solution is placed in a evaporating basin and is heated using a bunsen burner
the water evaporates leaving solid crystals behind
