Determination of Iron by Permanganate Titration

Determination of Iron by Permanganate Titration - Chemistry...

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Chemistry 1120 Determination of Iron by Permanganate Titration Data and Results Table I. Standard solution preparation Mass of KMnO 4 0.201 g Moles of KMnO 4 0.00127 moles Molarity of KMnO 4 II. Analysis of unknown Fe 2+ sample Unknown number 36643 Trial 1 Trial 2 Trial 3 Mass of Fe 2+ sample 0.803 g 0.807 g 0.801 g Initial buret reading 0.60 mL 14.82 mL 29.18 mL Final buret reading 14.82 mL 29.18 mL 43.38 mL Volume KMnO 4 added 14.22 mL 14.36 mL 14.20 mL Moles KMnO 4 added 1.81 × 10 -4 mol 1.82 × 10 -4 mol 1.80 × 10 -4 mol Mass Fe 2+ in unknown 0.0505 g 0.0508 g 0.0505 g % Fe 2+ in the sample 6.29 % 6.30 % 6.27 % Average % Fe 2+ 6.29 % Parts per thousand (ppt) 4.77 ppt Calculations 1. Show the calculation to determine the moles of KMnO 4 used to make the standard. 0.201 g KMnO 4 × 1 mol KMnO 4 = 0.00127 mols KMnO 4 158.024 g KMnO 4 2. Show the calculation to obtain the molarity of the purple KMnO 4 solution. 100 mL aqueous solution
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Determination of Iron by Permanganate Titration - Chemistry...

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