Practical tips Flashcards
why is it important to fill the space below the tap in the burette before an accurate titration?
as space will fill during titration, so titres will be too large.
why is a conical flask better than a beaker for a titration?
less chance of losing liquid due to splashing on swirling.
why can rinsing the inside of the conical flask with distilled water during a titration increase the accuracy of the endpoint?
as reactants around the sides of the conical flask are washes into the reaction mixture so they all react.
why does repeating a titration make the average titre more accurate?
as a single titration result could be anomalous.
why may yield be low in the synthesis and purification of an organic substance?
incomplete reaction, loss of product during separation and purification.
Order of purification of an organic liquid:
removal of acidic impurities, separate, wash, separate, dry, filtration, distillation
