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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

The reaction

2I - ( a q ) +S 2 O 8 2- ( a q ) I 2 ( a q ) +2SO 4 2- ( a q )

was studied at 25°C. The following results were obtained where

Rate = Δ [ S 2 O 8 2- ] Δ t

[I]0(mol/L) [S2O82−]0(mol/L) Initial Rate (mol/L · s)
0.080 0.040 12.5 × 10−6
0.040 0.040 6.25 × 10−6
0.080 0.020 6.25 × 10−6
0.032 0.040 5.00 × 10−6
0.060 0.030 7.00 × 10−6

a. Determine the rate law.

b. Calculate a value for the rate constant for each experiment and an average value for the rate constant

Interpretation Introduction

Interpretation: A reaction between I and S2O82 and its rate expression is given. The rate law and the value of the rate constant are to be calculated.

Concept introduction: The relation between the reaction rate and the concentration of the reactants is stated by the rate law.

Explanation

Given

The stated reaction is,

2I(aq)+S2O82(aq)I2(aq)+2SO42(aq)

The rate law for the given reaction is calculated by the expression,

Rate=k[I]m[S2O82]n

Where,

  • [I] and [S2O82] are the concentrations of I and S2O82 .
  • k is the rate constant.

The values of and n are calculated by the comparison of the different rate values from the given table.

The value of m is calculated using the first and second result as only the value of [I] changes in these results. Substitute the values of the concentration of [I] and [S2O82] for the first two experiments in the above expression.

Rate1=k[0.080]m[0.040]n

Rate2=k[0.040]m[0.040]n

According to the given rate values in the table,

Rate2Rate1=6.25×106mol/Ls12.5×106mol/Ls

Therefore,

k[0.040]m[0.040]nk[0.080]m[0.040]n=6.25×106mol/Ls12.5×106mol/Ls(0

(b)

Interpretation Introduction

Interpretation: A reaction between I and S2O82 and its rate expression is given. The rate law and the value of the rate constant are to be calculated.

Concept introduction: The relation between the reaction rate and the concentration of the reactants is stated by the rate law.

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