M. Id: Svetion, Q.1) In the first order reaction of dye' with NaOH solution at 25 C, when 4 ml of 0.85 M BaCl₂ solution was added to the reaction mixture composes of (15 ml of dye", 15 ml of NaOH and 50 ml of distilled water), the absorbance of dye was recorded 0,635 at 590nm after 4 minutes. 1) Calculate the absorbance for dye' after 15 minutes if the half-life for the reaction 11 minutes. 2) Calculate the rate constant (Ko) for the reaction (min).

M. Id: Svetion, Q.1) In the first order reaction of dye' with NaOH solution at 25 C, when 4 ml of 0.85 M BaCl₂ solution was added to the reaction mixture composes of (15 ml of dye", 15 ml of NaOH and 50 ml of distilled water), the absorbance of dye was recorded 0,635 at 590nm after 4 minutes. 1) Calculate the absorbance for dye' after 15 minutes if the half-life for the reaction 11 minutes. 2) Calculate the rate constant (Ko) for the reaction (min).

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions

Section: Chapter Questions

Problem 85IL: The color change accompanying the reaction of phenolphthalein with strong base is illustrated below....

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The color change accompanying the reaction of phenolphthalein with strong base is illustrated below. The change in concentration of the dye can be followed by spectrophotometry (Section 4.9), and some data collected by that approach are given below. The initial concentrations were [phenolphthalein] = 0.0050 mol/L and [OH] = 0.61 mol/L. (Data are taken from review materials for kinetics at chemed.chem.purdue.edu.) (For more details on this reaction see L Nicholson, Journal of Chemical Education, Vol. 66, p. 725, 1989.) (a) Plot the data above as [phenolphthalein] versus time, and determine the average rate from t = 0 to t = 15 seconds and from t = 100 seconds to t = 125 seconds. Does the rate change? If so, why? (b) Use a graphical method to determine the order of the reaction with respect to phenolphthalein. Write the rate law, and determine the rate constant. (c) What is the half-life for the reaction?
Q.2) In the first order reaction of KI with K₂S₂O8 at 25 C°, a 10 ml sample of the reaction required 5.4 ml of Na2S2O3 solution to neutralize after 3 minutes and 14 ml of Na2S2O3 solution to neutralize at infinite time. 1- How many ml of Na2S2O3 solution required to neutralize the same sample volume after 9 minutes. 2- Calculate the half-life (min.) for the reaction.
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