ClockReaction_IntegratedRateLaws_Teacher - 1.05 g/cm 3 . To...

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Vitamin C Clock, Integrated Rate Laws: Teacher Guide Preparing Reagents: Material Instructions to make 1 L of each solution 0.25 M H 2 O 2 Start with 3 % H 2 O 2 (can be purchased at a drugstore). This solution is approximately 1 M. Dilute by 4 (e.g. mix 250 ml of this solution and 750 ml of deionized water) to achieve the desired concentration. 1.25 M NaI Sodium iodide has a molecular mass of 149.89 g/mol. To prepare a 1.25 M NaI solution, dissolve 187.3 g in 1 L of deionized water. 0.11 M Vitamin C Vitamin C, also known as L-ascorbic acid, has a molecular mass of 176.12 g/mol. To prepare a 0.11 M vitamin C solution, dissolve 19.4 g in 1 L of deionized water. 1 M acetic acid with starch Acetic acid (glacial) has a molar mass of 60.05 g/mol and a density of
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Unformatted text preview: 1.05 g/cm 3 . To make the desired solution, combine 57 ml of acetic acid with 143 ml of spray starch (can be bought in a can from a drugstore) and 800 ml of water. Of these solutions, you will need the following amount per set of experiments: 9 ml of 0.25 M H 2 O 2 18 ml of 1.25 M NaI 10.5 ml of 0.11 M Vitamin C 3 ml of 1 M acetic acid with starch Other materials (per set of experiments): deionized water (7.5 ml) 2 1 ml syringes 3 5 ml syringes 6 large test tubes or vials (each tube or vial should have a volume of at least 15 ml for adequate mixing) a stopwatch References 1. Wright, Stephen W. J. Chem. Ed. 2002 , 79 (1), 41-43. 2. Vitz, E. J. Chem. Ed. 2007 , 84 (7), 1156-1157....
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