6 I- + BrO3- + 6 H+ ----- 3 I2 + Br- + 3 H2O Rate= k[I-]m[BrO3-]n[H+]p rate= (∆[I2])/(3*∆time) [I-] 0.010M [S2O3-2] 0.0010M H2O [BrO3-] 0.04M HCl 0.10M Starch Indicator (sec.) Volume, ml Volume, ml Volume, ml Volume, ml Volume, ml 1 10 10 20 10 10 1-3 drops 301.90 2 20 10 10 10 10 1-3 drops 213.28 3 10 10 10 20 10 1-3 drops 214.92 4 10 10 10 10 20 1-3 drops 86.45 Temperature of Reaction: _20 C 1. Using the dilution equation (M1V1 = M2V2) calculate the concentration of the I-, BrO3- and the H+ (HCl) in the final mixture just prior to any reaction. 2. Calculate the rate for each experiment as explained in the background information. 3. Using the information above determine the rate law (m, n and p) for the reaction. Show all calculations/reasoning in your notebook. m_ n_ p Rate= k[I-]m[BrO3-]n[H+]p Calculate the rate constant for each experiment and then the average. k k k k Average value of k __________ (include units) Rewrite rate law including values for m, n, p and the average value of k:

Chemistry for Engineering Students

3rd Edition

ISBN:9781285199023

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.61PAE

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6 I^- + BrO₃^- + 6 H⁺ ----- 3 I₂ + Br^- + 3 H₂O

Rate= k[I^-]^m[BrO₃^-]ⁿ[H⁺]^p

rate= (∆[I₂])/(3*∆time)


	[I^-] 0.010M	[S₂O₃^-2] 0.0010M	H₂O	[BrO₃^-] 0.04M	HCl 0.10M	Starch Indicator	(sec.)
	Volume, ml	Volume, ml	Volume, ml	Volume, ml	Volume, ml
1	10	10	20	10	10	1-3 drops	301.90
2	20	10	10	10	10	1-3 drops	213.28
3	10	10	10	20	10	1-3 drops	214.92
4	10	10	10	10	20	1-3 drops	86.45

Temperature of Reaction: _______20 C________

1. Using the dilution equation (M1V1 = M2V2) calculate the concentration of the I-, BrO3- and the H+ (HCl) in the final mixture just prior to any reaction.

2. Calculate the rate for each experiment as explained in the background information.

3. Using the information above determine the rate law (m, n and p) for the reaction. Show all calculations/reasoning in your notebook.

m_____________ n_________________ p ____________

Rate= k[I^-]^m[BrO3^-]ⁿ[H⁺]^p

Calculate the rate constant for each experiment and then the average.

k______________ k________________ k________________ k ____________

Average value of k __________________ (include units)

Rewrite rate law including values for m, n, p and the average value of k:

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