exp13_prelab

# Exp13_prelab - Experiment 13 Chemical Kinetics Reaction of Crystal Violet With Sodium Hydroxide Learning Objectives Apply Beer's Law Determine

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Experiment 13: Chemical Kinetics Reaction of Crystal Violet With Sodium Hydroxide

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Learning Objectives z Apply Beer s Law z Determine relationship between absorbance and concentration of crystal violet z Determine the rate law and rate constant for reaction of crystal violet with sodium hydroxide z Graphical Method: Integrated Rate Laws (1 st week) z Method of Initial Rates (2 nd week) z Compare and contrast methods for determining reaction rates
Crystal Violet z Molecule that contains conjugated pi ( π ) bonds z π bond = double bonds z Conjugation = alternating single ( σ ) and π bonds CN ( C H 3 ) 2 N(CH 3 ) 2 N(CH 3 ) 2 Crystal Violet (Intense Violet Color) + OH CN ( C H 3 ) 2 N(CH 3 ) 2 N(CH 3

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Colorimeter z Measures the amount of light that is absorbed by a solution z Amount of light absorbed is directly proportional to the concentration of absorbing molecule
Beer s Law z Mathematical equation relating absorbance of light to concentration of molecules A = ε b c z A = absorbance = -log (I/I o ) z ε = molar absorptivity z Measure of the ability to absorb light at a particular wavelength z b = path length = cuvette width (1.00 cm) z c = concentration of solution

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Standard Curve: Applying Beer’s Law z Prepare standards z Solutions of known concentration z Measure Absorbance z Graph Absorbance vs. Concentration z Linear regression provides mathematical relationship (Beer’s Law)
z Field in chemistry concerned with the rates of various reactions z The rate can be determined experimentally in a variety of ways, change in absorbance, pH, conductance, etc. z

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## This note was uploaded on 03/19/2008 for the course CHEM 102 taught by Professor Todd during the Spring '08 term at UNC.

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Exp13_prelab - Experiment 13 Chemical Kinetics Reaction of Crystal Violet With Sodium Hydroxide Learning Objectives Apply Beer's Law Determine

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