Why it is necessary to filter off the anhydrous magnesium sulfate before distillation?
Drying with magnesium sulfate leaves very tiny residues in your flask which need to be filtered off as decanting won’t get rid of them. Leaving these tiny residues in the flask while running a distillation can cause the solvent to “bump”; in other words to violently erupt and run into your condenser, thus rendering your distillation ineffective.