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Iron in Iron Pills Methods

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Submitted By elope182
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. Standardization of potassium manganate(VII) solution 1) About 9.8g of ammonium iron(II) sulphate was accurately weighed out. Then it was dissolved in 25ml of sulphuric acid. The mixture was diluted with distilled water and was made up to exactly 250.0ml of solution. 2) 25.0ml of this solution was pipetted into a conical flask. 25ml of 1M sulphuric acid was added to it. 3) It was titrated with potassium manganate(VII) solution until a permanent pink colour was obtained (would not disappear after 30 seconds).
B. Determination of the mass of iron in one gram of the iron tablet
1) Five iron tablets were weighed accurately and their masses were recorded. .
2) They were grinded up in a mortar and were pestled with about 5 cm3 of 1M sulphuric acid.
3) The acid and tablets were transferred through a small filter funnel into a 250.0 cm3 volumetric flask. The mortar and pestle were rinsed with further quantities of acid, each portion were transferred carefully into the flask, until all trace of the iron tablets had gone.
4) The funnel was rinsed with more acid, and then 1M sulphuric acid was added to the flask until the solution reaches the 250.0 cm3 mark. The flask was stoppered and was inverted several times to mix the solution.
5) 25.0 cm3 of the solution was pipetted from the volumetric flask and was transferred to a conical flask.
6) A burette was filled with the potassium manganate(VII) solution.
7) The potassium manganate(VII) solution was titrated against the solution in the conical flask. The volume of potassium manganate(VII) solution used at the end point was recorded.

To prepare 250 mL of a 0.1 mol/L solution of Potassium permanganate (KMnO4) we have to dissolve 15.8032 g of KMnO4 (formula weight is 158.032 g/mol) in deionized or distilled water, and then dilute the solution to a final volume with deionized (distilled) water.

* Transfer the prepared solution to a clean, dry storage bottle and label it. Never store solutions in a volumetric flask.

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