Answered: Hydrogen peroxide and the iodide ion…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter11: Rate Of Reaction

Section: Chapter Questions

Problem 26QAP: When nitrogen dioxide reacts with carbon monoxide, the following reaction occurs. Â...

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Hydrogen peroxide and the iodide ion react in acidic solution as follows:

H2O2(aq) + 3I^- (aq) + 2H⁺ (aq) =====➔I ^-(₃aq) + 2H2O(l)

The kinetics of this reaction were studied by following the decay of the concentration of H₂O₂ and constructing plots of ln[H₂O₂] versus time. All the plots were linear and all solutions had [H2O2]_o = 8.0 x10^-4 mol/L. The slopes of these straight lines depended on the initial concentrations of I^- and H^-. The results follow:

[I^_]0	[H⁺]0	Slope
(mol/L)	(mol/L)	(/min)
0.1000	0.0400	-0.120
0.3000	0.0400	-0.360
0.4000	0.0400	-0.480
0.0750	0.0200	-0.0760
0.0750	0.0800	-0.118
0.0750	0.1600	-0.174

The rate law for this reaction has the form;

Rate = -d[H₂O₂]/dt = (k₁ +k₂[H⁺]) [I^-] ^m[H₂O₂]ⁿ

a. Specify the orders of this reaction with respect to [H2O2] and [I^-].

b. Calculate the values of the rate constants k1 and k

c. What reason could there be for the two-term dependence of the rate on [H⁺]?

Hydrogen peroxide and the iodide ion react in acidic solution as follows:
H,O,(aq) + 31'(aq) + 2H*(aq) - I, (aq) + 2H,O(1)
The kinetics of this reaction were studied by following the concentration of H,O,
and constructing plots of In[H,0] vs. time. All plots were linear and all
solutions had [H,O,], = 8.0 × 104 mole/L. The slopes of these straight lines
depended on the initial concentrations of I and H* as follows:
[I], (mole/L)
0.1000
0.3000
[H*], (mole/L)
0.0400
0.0400
Slope (min")
-0.120
-0.360
0.4000
0.0750
0.0400
-0.480
0.0200
-0.0760
0.0750
0.0800
-0.118
0.0750
0.1600
-0.174
The rate law for this reaction has the form
Rate = -d[H,O,]/dt = (k, + k, [H'])[I]™ [H,O,]"
Specify the orders of the reaction with respect to [I] and H,O,].
Calculate the values of the rate constants k, and k,.
What reason could there be for the two-term dependence of the rate on
[H*]?
а.
b.
С.

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