Brainstorm and develop a lab procedure where we could have tested only the effects of concentration for this reaction (or at least minimized the effects of other factors).
a) Prepare solutions of different concentrations of reactants and measure the rate of reaction by monitoring the change in color over time.
b) Use a fixed concentration of reactants and vary the temperature of the reaction vessel while keeping other factors constant.
c) Alter the pressure of the reaction system while maintaining a constant concentration of reactants and monitor the change in reaction rate.
d) Add a catalyst to the reaction mixture and observe its effect on the rate of reaction while keeping the concentration of reactants constant.