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Over time, BPB converts to a colorless molecule in the presence of OH¯ ions. To study the rate of the reaction, the student recorded the absorbance of the BPB solution at 590 nm in a 0.50 M NaOH solution. The temperature and [OH¯] remain constant throughout the reaction. The results are summarized in the table below. Time Absorbance (min) 0.60 4 0.48 8 0.38 12 0.30

Over time, BPB converts to a colorless molecule in the presence of OH¯ ions. To study the rate of the reaction, the student recorded the absorbance of the BPB solution at 590 nm in a 0.50 M NaOH solution. The temperature and [OH¯] remain constant throughout the reaction. The results are summarized in the table below. Time Absorbance (min) 0.60 4 0.48 8 0.38 12 0.30

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Over time, BPB converts to a colorless molecule in the presence of OH¯ ions. To study the rate of the reaction, the student recorded the absorbance of the BPB solution at 590 nm in a 0.50 M NaOH solution. The temperature and [OH¯] remain constant throughout the reaction. The results are summarized in the table below. Time Absorbance (min) 0.60 4 0.48 8 0.38 12 0.30 16 0.24 20 0.19 24 0.15 (f) Determine the half-life of the reaction. Include units with your answer. (g) Explain how the absorbance and time data are consistent with a process that is first order with respect to BPB. A second trial is conducted at the same constant temperature, but with [OH] changed to 2.00 M. The observed half-life of the reaction is shorter than for the first trial when [OH¯]was 0.50 M. (h) Explain, in term of particle collisions, why the half-life of the reaction decreases when [OH¯]is changed from 0.50 M to 2.00 M. (i) Is the activation energy for the reaction when [OH¯]is 2.00 M greater than, the same as, or less than the activation energy when [OH ]is 0.50 M? Justify your answer.
Transcribed Image Text:Over time, BPB converts to a colorless molecule in the presence of OH¯ ions. To study the rate of the reaction, the student recorded the absorbance of the BPB solution at 590 nm in a 0.50 M NaOH solution. The temperature and [OH¯] remain constant throughout the reaction. The results are summarized in the table below. Time Absorbance (min) 0.60 4 0.48 8 0.38 12 0.30 16 0.24 20 0.19 24 0.15 (f) Determine the half-life of the reaction. Include units with your answer. (g) Explain how the absorbance and time data are consistent with a process that is first order with respect to BPB. A second trial is conducted at the same constant temperature, but with [OH] changed to 2.00 M. The observed half-life of the reaction is shorter than for the first trial when [OH¯]was 0.50 M. (h) Explain, in term of particle collisions, why the half-life of the reaction decreases when [OH¯]is changed from 0.50 M to 2.00 M. (i) Is the activation energy for the reaction when [OH¯]is 2.00 M greater than, the same as, or less than the activation energy when [OH ]is 0.50 M? Justify your answer.
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