When pyridine is added to a solution of iodine in carbon tetrachloride the 520nm band of absorption
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When pyridine is added to a solution of iodine in carbon tetrachloride the 520nm band of absorption shifts toward 450nm. However, the absorbance of the solution at 490nm remains constant: this feature is called an isosbestic point. Show that an isosbestic point should occur when two absorbing species are in equilibrium.
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The two absorbing species are in equilibrium when their concentrations are equal At this point the absorbance of the solution at 490nm should be constant An isosbestic point is a point at which the absorbance of a solution remains constant This occurs when two absorbing species are in equilibrium meaning their concentrations are equal The absorbance of a solution at a particular wavelength is given by the equation A bc where is the molar absorptivity b is the path length and c is the concentration ...View the full answer
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Related Book For
Physical Chemistry Thermodynamics And Kinetics
ISBN: 9781464124518
10th Edition
Authors: Peter Atkins, Julio De Paula
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