... manganate 7 solution. The potassium manganate solution is added to the iron solution slowly until the iron solution has a slight pink coloration. The volume level on the burette is recorded. This is repeated until two consistent results have been recorded. Results 1st Titration 2nd Titration 3rd Titration 4th Titration 1st Reading 0 0 0 0 2nd Reading 2.4 2.9 2.5 2.4 Calculations 1. Calculate the number of moles of potassium manganate 7 in average burette volume: KMnO4 = 0.019 mol dm-3 Number of moles of KMnO4 used = 2.55 / 1000 * 0.019 mol dm-3 = 48.45x10-6 moles 2. Knowing the reacting ratio of 1 MnO4 : 5Fe2+ deduce the number of moles of Fe2+ in 10cm3 of solution. 48.45x10-6 *5 = 242.25 x 10-6 moles in 10cm3 of solution. 3. Hence calculate the moles of Fe2+ (which is the same as moles of FeSO4 ) in the whole 100cm3 of solution. = 2.42x10-3 moles 4. Hence mass of FeSO4 in 2 tablets. Iron 56 molecular mass. Sulphate 96 ...

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