Question

1.describe how you would separate a mixture of acetanilide and sand
2.water is a convenient solvent for recrsytallizing what type of compound.
3. why is fluted filter paper usually used when doing the hot filtration during a recrystallization.
4.describe how seed crystal are used in recrystallization.
5.explain the adage " like dissolve lik

Answer 1

1.We add water into a mixture of acetanilide and sand. Acetanilide will dissolve in water and by filtration we can sepearte sand. Evaporating the water will give pure acetanilide.

2.Since ionic compounds are soluble in water but not soluble in organic solvent, hence water is a convenient solvent for recrsytallizing ionic compound like NaCl. KCl etc.

4. If we add very small amount of a compound in it's saturated solution then process of crystallisation will be speeded up giving large amount of crystals in a very small time. this is the seed crystallisation.

5. Like dissolve like means polar compounds dissolve in polar solvent and non-polar compounds dissolve in non-polar solvent. For example, polar compound NaCl dissolve in polar solvent water but not in non-polar solvent benzene.