prelab3 - samples FeASH, dissolving them in about 40mL of...

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10/30/06 Exp.3 Redox titration PROCEDURE First, a 0.02 M solution of Potassium Permanganate will be made by weighing 0.65 grams of KmnO 4 and dissolving it in three increments with 75mL, 75mL, then 50mL, for a total of 200mL of water and stirring well between. The solution will then be decanted into a beaker so as not to contaminate with any solid potassium permanganate. After rinsing the buret with soap and water then a small amount of the solution, the Potassium Permanganate solution will be standardized by weighing three 1 gram
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Unformatted text preview: samples FeASH, dissolving them in about 40mL of water, then titrating them to a pink color change. The unknown samples will be titrated in the same manner and the weight of iron in the unknown and then the percent iron in the sample will be calculated. REACTIONS KMnO 4 (aq) --H 2---> K + (aq) + MnO 4-(aq) Fe(NH 4 ) 2 (SO 4 ) 2 . 6H 2 O H 2 O---> Fe 2+ (aq) + 2NH 4 + (aq) + 2SO 4 2+ (aq) + 6H 2 O Overall: 8H + (aq) + MnO 4- (aq) -----> Mn 2+ (aq) + 5Fe 3+ (aq) + 4H 2 O (l)...
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