2CLabManual201303

Divide the solution approximately in half into two

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Unformatted text preview: swirl until the solids have dissolved. Continue gradually adding water and swirling the flask to keep the contents well mixed, and finally add water from a disposable pipet to bring the liquid level to the mark. Do a final mixing by inverting and swirling the flask at least 30 times. Divide the solution approximately in half into two 250 mL beakers. To one beaker add 1 g of oxalic acid and stir with a glass rod until the oxalic acid has dissolved. Label each of the beakers so that the one containing oxalic acid can be distinguished from the one without. Add 1 mL of 0.05 M ferric nitrate solution to each of the beakers and set them aside. 77 Part II. Titrations Do these titrations one at a time--in other words, do not let ascorbic acid solutions sit around exposed to the atmosphere for very long. Assaying your NBS solution: With a volumetric pipet take a 10 mL aliquot of the "partnership's" standard ascorbic acid solution and add it to a 125 mL Erlenmeyer flask that already contains 20 mL of water, 2/3 mL of 6 M acetic acid, 5 mL of 4% KI solution and 1 mL of starc...
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