Titration

Question 1

Describe a method for finding the volume of an acid that reacts with a known volume of alkaline solution.

Answer 1

• Pour the alkaline solution into a conical flask.
• Add a few drops of indicator.
• Using a funnel, fill a burette with the acid and record initial volume.
• Using the burette, slowly add the acid to the alkaline solution a few drops at a time.
• Regularly swirl the conical flask until the end-point (colour change).
• The indicator changes colour once neutralisation has taken place.
• Calculate the volume of acid needed to neutralise the alkali by subtracting the final volume from the initial volume.

Question 2

Suggest why you should repeat a titration until you have consist readings.

Answer 2

To increase accuracy.
To detect any anomalous results.