1 Titration is used to ensure
maximum purity when
forming a solution
2 EXAMPLE EXPERIMENT
2.1 1. Clamp the burette and fill it with sulphuric acid, to just
above zero. Then record the level of acid in the burette.
2.2 How to form ammonium sulphate:
2.3 2. Use a pipette to transport 25cm^3 of ammonia into a
conical flask. Use a pipette filler for accurate results.
2.4 3. Add a few drops of methyl orange indicator and make sure
that the solution turns yellow- this makes sure that you are
using an alkali. And then move the conical flask under the burette.
2.5 4a. Turn the tap to the vertical position to allow the acid out of the burette. Keep swirling the flask
with one hand to ensure that you get accurate results. Continue to add the acid until the indicator
turns from yellow to red. Then minus your starting volume from the volume of acid left in the
burette to get your result for how much acid you used.
2.5.1 A ROUGH TITRATION
2.6 4b. Add the acid slowly until you are within 2 cm^3 of your result from the rough
titration. Then continue to add the acid drop by drop until one drop changes the
solution to red. Remember to keep swirling the flask with your other hand. Note the
volume of acid left and then minus that from your stating volume. This is the exact
amount of acid needed to form the purest solution with the ammonium sulphate.