Question

QUESTION 9

1. Use the following information for the reaction: 2 ClO ₂(aq) + 2 OH ^- (aq) → ClO ₃^-(aq) + ClO ₂^-(aq) + H ₂O(l)

   Experiment	[ClO2] (mol/L)	[OH- ] (mol/L)	Initial Rate (mol/L-min)
   i	0.020	0.030	0.00276
   ii	0.060	0.030	0.0248
   iii	0.020	0.090	0.00828

   By what nearest whole number factor does the initial rate change from experiment i to experiment ii?

   In the analysis of this data would it be useful to compare data for experiment ii with that in experiment iii? Why?

   		Comparing the data for experiment ii and iii would be useful because the concentration of both reactants changed speeding up the process of determining the effect of each reactant on the rate.
   		Comparing the data for experiment ii and iii would not be useful because the concentration of both reactants changed making it impossible to determine the individual effect of each reactant on the rate.
   		None of the other answers are applicable.

QUESTION 13

1. What must be nearest whole number value of the order for the reactant ClO ₂?

Answer 1

To determine the order of a reaction with respect to a partcular reactant we have to choose any two reactants where the concentration of other reactant is constant. So that we can study about the effect of change of reactant on the rate of reaction.

Now in the given experiment to know the order of ClO2 we have to choose expt 1 and 2 where the concentration of OH- is constant.

I.e

Here choosing expt 2 and 3 won't be useful because the concentration of both reactants changed making it impossible to determine the individual effect of each reactant on the rate. To know about the rate of change we have to keep one reactant constant and study the effect of other.