2a list of techniques used to separate mixtures is given below.
fractional
distillation
simple
distillation crystallization filtration diffusion
from the list choose the most suitable technique to separate the following.
water from aqueous copper(ii)
helium from a mixture of helium and
copper(ii) sulphate from aqueous copper(ii)
ethanol from aqueous
barium sulphate from a mixture of water and barium