ClockReaction_InitialRates_Teacher

ClockReaction_InitialRates_Teacher - 1.05 g/cm 3 . To make...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Vitamin C Clock Reaction Initial Rates: 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. 0.25 M NaI Sodium iodide has a molecular mass of 149.89 g/mol. To prepare a 0.25 M NaI solution, dissolve 37.5 g in 1 L of deionized water. 0.05 M Vitamin C Vitamin C, also known as L-ascorbic acid, has a molecular mass of 176.12 g/mol. To prepare a 0.05 M vitamin C solution, dissolve 8.8 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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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: • 25.5 ml of 0.25 M H 2 O 2 • 25.5 ml of 0.25 M NaI • 5.5 ml of 0.05 M Vitamin C • 5.5 ml of 1 M acetic acid with starch Other materials (per set of experiments): • deionized water (15 ml) • 2 1 ml syringes • 3 5 ml syringes • 11 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....
View Full Document

This note was uploaded on 01/03/2012 for the course CH 102 taught by Professor Hill,m during the Fall '08 term at Caltech.

Ask a homework question - tutors are online