Chemical amounts (A2)
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How do I standardize a solution of potassium manganate(VII) by an iron(II) salt (ammonium iron(II) sulphate)?
Ulex says
You make up a solution of the iron(II) salt by accurate weighing and using a standard volumetric flask. Arrange to have the concentration of the iron(II) salt about 5 times that of the potassium manganate(VII). The molar mass is on the bottle label. In making up the solution to the mark, include a generous proportion of 1 M sulphuric acid. Titrate portions of the iron(II) solution (pipette) with your potassium manganate(VII) solution.
The titration is self-indicating.
Calculate the concentration of your potassium manganate(VII) from the fact that
1MnO4- is equivalent to 5Fe2+
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updated: 15 December 2006
