Flow diagram for Solid Mixture Separation by Solvent

Flow diagram for Solid Mixture Separation by Solvent Recrystallization Take MP of starting mix Hot water dissolves desired and impurity solubles; too much water creates problems later Dissolve 1. 0 grams in “minimum” hot water Fast filter using Buchner !. Save filtrate (liquid slurry in flask) Charcoal acts to decolorize ; reheating re-dissolves desired and impurity solubles Transfer filtrate to beaker; add charcoal; re-heat to boiling Boil a separate amount of hot water for later filtration step Precipitated product lost here in filter paper unless rinsed with some hot water from above

Fast filter using Buchner !. Save filtrate (liquid slurry in flask) The solution should contain impurities still in solution Discarded filtrate contains impurities Transfer filtrate to beaker; Recrystallize with ice Once crystals in abundance, filter and collect purified solid sample (acetanilide); discard filtrate more solid product can be lost here in filter paper unless rinsed with some hot water from above (keep to minimum) If you added too much water before, you may not get crystals…. scratching glass with stir rod sometimes helps Dry crystals 1 -2 days on watch glass mp 113 -114 o. C Light tan flakes • Weigh: % yield = 100 observed mass/1. 0 CRC 77 th (#86) • Re-record melting point CAS RN 103 -084 -4 Physical characterizations