VISKINET - VISIBLE SPECTROSCOPY PURDUE UNIVERSITY...

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VISIBLE SPECTROSCOPY PURDUE UNIVERSITY INSTRUMENT VAN PROJECT KINETIC STUDY OF THE REACTION OF KI WITH FeCl 3 (Revised: 5-20-96) INTRODUCTION Concentration of reactants is one factor which influences the rate of a chemical reaction. The following reaction will be investigated: 2 I - (aq) + 2 Fe 3+ (aq) ───────── > I 2 (aq) + 2 Fe 2+ (aq) The concentration of I - and Fe 3+ will be systematically varied, and the effect of these changes in solution absorbancies will be determined using a visible spectrophotometer. The rate expression for the reaction will then be calculated: Rate = k[I - ] x [Fe 3+ ] y , x,y = order with respect to reactants PURPOSE 1. To become familiar with the use of the visible spectrophotometer. 2. To determine the order of the reaction with respect to each reactant. 3. To write an overall rate expression for the reaction. SAFETY CONSIDERATIONS Goggles must be worn in the lab. PRE-LAB Consider the hypothetical reaction: A + B ───────── > product(s) The rate expression is: Rate = k[A] x [B] y Determine the values for x and y , from the following data: [A] [B] Rate 0.10 0.10 2.0 0.10 0.20 4.0 0.20 0.10 8.0
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VISIBLE SPECTROSCOPY PURDUE UNIVERSITY INSTRUMENT VAN PROJECT MATERIALS 3-5 mL pipets (graduated to 0.1 mL) small test tubes visible spectrophotometer cuvettes 0.020 M KI 0.020 M FeCl 3 distilled water safety goggles PROCEDURE 1. Warm up thespectrophotometer. Set wavelength at 450 nm. Prepare
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