A chemist wants to measure the rate of the following reaction: 2ClO2 (aq) + 2OH- (aq) ----> ClO3- (aq) + ClO2 (aq) + H2O

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A chemist wants to measure the rate of the following
reaction:
2ClO2 (aq) + 2OH- (aq) ---->
ClO3- (aq) + ClO2 (aq) + H2O (l)
a. Will the concentration of OHincrease, decrease, or stay the
same as time goes on?
b. Will the rate of the reaction increase, decrease, or stay the
same as time goes on?
The chemist mentioned in the problem measures the rate of the
same reaction, but this time she uses a higher concentration of
ClO2 but the same concentration of OH- . She notices a change in
the reaction rate. Is the reaction faster or slower this time?
The chemist mentioned in the problem measures the rate of the
same reaction with the same concentration of reactants, but this
time she does so at a lower temperature. Is the reaction faster or
slower this time?