Core Practical 11 : Find the amount of iron in an iron tablet using redox titration

Overview:

Procedure:

What is important to note with burette readings (including the mean titre)?

• all volumes measured using a burette should be recorded to 2 decimal places with the second figure being 0 or 5 only

Calculations:

Make a list of any procedural errors. Suggest ways in which these errors can be avoided.

• the colour change at the end point is subjective → to avoid this a white tile was used to better see the colour change

• Some KMnO4 got ‘stuck’ around the neck of the conical flask → to avoid this, wash the neck with some deionised water

• Overshooting end point → go drop wise when nearing predicted end point

Calculate the % uncertainty for the average titre: