Lab_Task_1.doc - 32nd IChO • Laboratory Task 1 30 points This experiment includes one preparation of a metal complex salt and two analyses of a

Lab_Task_1.doc - 32nd IChO • Laboratory Task 1 30 points...

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32 nd IChO • Laboratory Task 1 30 points This experiment includes one preparation of a metal complex salt and two analyses of a provided sample of the same compound. The compound is a “classic” within inorganic photo chemistry. Preparation of potassium tris(oxalato)manganate(III) hydrate, K 3 [Mn(C 2 O 4 ) 3 ]·xH 2 O Note 1: The [Mn(C 2 O 4 ) 3 ] 3– ion is photosensitive and should therefore be protected from light as far as possible. Also, the thermal stability of the title compound is low. Note 2: Before starting the synthesis, write down the thermometer reading in ice- water. Final version 22-10-19-03:20 1 of 4
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32 nd IChO • Laboratory Task 1 Student Code The synthesis comprises a reduction of manganese(VII) to manganese(II) with oxalic acid at 70 - 75 °C. After the addition of the sufficient amount of potassium ions in form of potassium carbonate, manganese(III) is formed by the addition of manganese(VII) at a temperature below 2 °C. 2 MnO 4 (aq) + 8 C 2 O 4 H 2 (aq) 2 Mn 2+ (aq) + 10 CO 2 (g) + 3 C 2 O 4 2– (aq) + 8 H 2 O(l) C 2 O 4 H 2 (aq) + CO 3 2– (aq) C 2 O 4 2– (aq) + CO 2 (g) + H 2 O(l) 4 Mn 2+ (aq) + MnO 4 (aq) + 11 C 2 O 4 2– (aq) + 4 C 2 O 4 H 2 (aq) 5 [Mn(C 2 O 4 ) 3 ] 3– (aq) + 4 H 2 O(l) Dissolve 5.00 g of C 2 O 4 H 2 ·2H 2 O in 35 mL of water in a 150 mL beaker by heating to 70 °C. Slowly add 1.00 g of KMnO 4 with magnetic stirring. The temperature must not exceed 70 - 75 °C. When the mixture is colourless, add 1.10 g of K
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  • Spring '19
  • dania

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