An analyst performed a redox titration to determine the concentration of iron(II) ions in a sample of river water using standard potassium manganate(VII) solution. The table below shows the results of the titrations.
| Rough titration | Accurate titration 1 | Accurate titration 2 | Accurate titration 3 | |
|---|---|---|---|---|
| Final reading on burette in cm3\text{cm}^3cm3 | 16.35 | 15.90 | 16.75 | 17.30 |
| Initial reading on burette in cm3\text{cm}^3cm3 | 0.50 | 0.45 | 1.20 | 1.80 |
| Volume of potassium manganate(VII) solution added in cm3\text{cm}^3cm3 | 15.45 | 15.55 | 15.50 |
Calculate the mean volume of potassium manganate(VII) solution used in the accurate titrations.
Practise Edexcel GCSE Chemistry Quantitative analysis with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.