20 - AP Chemistry Lab Brockport High School NY USA...

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Unformatted text preview: AP Chemistry Lab Brockport High School NY USA Oxidation-Reduction Titrations: Determination of Oxalate Mr Keefer Introduction Oxalate compounds have importance in many chemical and biological reactions. They are used in the photographic sciences, and are the main component of kidney stones. Excess vitamin C is converted into oxalate and excreted in the gut and urine, therefore, kidney stone patients must limit their intake of vitamin C to control the formation of calcium oxalate stones, as well as foods high in oxalate, such as spinach, beets, and beans. Potassium permanganate reacts with oxalate ions to produce carbon dioxide and water in an acidic solution, and the permanganate ion is reduced to manganese (II) as follows: 5C 2 O 4 2- (aq) + 2MnO 4- (aq) + 16H + (aq) 10CO 2(g) + 8H 2 (l) + 2Mn 2+ (aq) No indicators are necessary in permanganate titrations because the end point is easily observed. The permanganate ion is intensely purple, whereas the manganese (II) ion is nearly colorless. The first slight permanganate ion is intensely purple, whereas the manganese (II) ion is nearly colorless....
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This note was uploaded on 08/31/2010 for the course SCI 56-1120 taught by Professor Unni during the Spring '09 term at Columbia College.

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