Potassium Manganate (VII)/Ammonium Iron (II) Sulphate Titration

Chemistry page

Equipment:

• Potassium manganate (VII) solution
• 0.1M ammonium iron (II) solution
• 1.5M sulfuric acid solution
• Deionised water
• Pipette and filler
• Burette
• Funnel
• Retort stand and clamp
• White til
• Conical flask
• Graduated cylinder

Experiment:

1. Wash burette, conical flask and pipette with deionised water.
2. Rinse burette with potassium manganate (VII) and pipette with iron (II) solution.
3. Pipette 25cm³ of iron (II) solution into conical flask and add 10cm³ of sulfuric acid.
4. Fill burette with potassium manganate (VII) making sure tap is filled below zero. Take readings from top of meniscus.
5. Carry out one rough and two accurate titrations. Colour change purple to pink
6. Calculate concentration of potassium manganate (VII) solution