3+ are shown below. Are these 5.27 The rate constants for some anations of [Cr(NH3)5H2O] data consistent with a dissociative or associative mechanism? Write an equation for the rate-determining step of these reactions and briefly justify your answer. k [Cr(NH3)5H2O]3+ +L- > [Cr(NH3)5L]2+ L- k, M's-1 log k NCS 4.2 x 104 0.7 x 10-4 3.7 x 10-4 1.4 x 10-4 -3.38 CI -4.1 Br -3.43 CF;COO -3.85 Source: Data from the work of T. Ramasami and A.G. Sykes, J.C.S. Chem. Comm. (1976): 378.

3+ are shown below. Are these 5.27 The rate constants for some anations of [Cr(NH3)5H2O] data consistent with a dissociative or associative mechanism? Write an equation for the rate-determining step of these reactions and briefly justify your answer. k [Cr(NH3)5H2O]3+ +L- > [Cr(NH3)5L]2+ L- k, M's-1 log k NCS 4.2 x 104 0.7 x 10-4 3.7 x 10-4 1.4 x 10-4 -3.38 CI -4.1 Br -3.43 CF;COO -3.85 Source: Data from the work of T. Ramasami and A.G. Sykes, J.C.S. Chem. Comm. (1976): 378.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter13: Kinetic Methods

Section: Chapter Questions

Problem 8P

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Consider a kinetics study of the following ligand substitution reaction: trans-[Rh(en)2Cl2] + + 2 Y−  trans-[Rh(en)2Y2] + + 2 Cl− When Y− = I−, Br−, and NO2 −, the reaction rate constants are 5.2 x 10-5 , 4.0 x 10-5 , and 4.2 x 10-5 M-1 s-1 , respectively. By which mechanism does this reaction most likely proceed? Justify your answer.
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The red color of soil is often due to the presence of iron. Metal ions are extracted from soil by stirring the soil in acid and then filtering the solution. One method for the analysis of Fe2+ is to form the highly colored Fe2+–thioglycolic acid complex. The complex absorbs strongly at 535 nm. Calibration standards of 1.00, 2.00, 3.00, 4.00, and 5.00 ppm are prepared by transferring appropriate amounts of a 10.0 ppm working solution of Fe2+ into separate 50-mL volumetric flasks, each of which contains 5 mL of thioglycolic acid, 2 mL of 20% w/v ammonium citrate, and 5 mL of 0.22 M NH3. After diluting to volume and mixing, the absorbances of the standards are measured. a)Use the data table below to prepare a calibration curve (absorbance versus concentration in ppm). Fit the data to straight line and find the equation for the straight line and the R2 value. (Hint: Think about what to do with the absorbance of the blank.)
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