Explore BrainMass

Rate Law and Rate Constant

Question 1. Write the rate law and give the rate constant for this reaction.

2 ClO2(aq) + 2 OH^-(aq) ---> ClO-3(aq) + ClO2^-(aq) + H2O(l)

The following rate data were collected:

Experiment----------[ClO2]---------[OH-]-----------initial rate
1----------------------0.060M-------0.030M--------0.0248 M/s
2--------------------- 0.020M-------0.030M--------0.00276 M/s
3----------------------0.020M-------0.090M--------0.00828 M/s

Question 2. Several experiments for the reaction A + B + 2C ----> products gave these results

Experiment ------Initial [A]-------Initial [B]-----Initial [C]--------- Initial rate
1------------------ 0.20 M---------0.40 M--------0.10 M-----------1.2 M/s
2 ------------------0.20 M --------1.60 M -------0.10 M------------4.8 M/s
3-------------------0.20 M---------0.80 M-------0.20 M------------9.6 M/s
4 ------------------0.40 M---------0.80 M-------0.20 M------------9.6 M/s
5-------------------0.20 M---------0.40 M-------0.30 M------------10.8 M/s

Find the order with respect to A. Find the order with respect to B. Find the order with respect to C. When you find each order, you must state which two experiments you are using to find that order. Find the rate constant.

Solution Preview

Q1: From 2 to 1, there is 3 fold increase in [ClO2], the initial rate increases 9.00 folds. Therefore, the rate is proportional to [ClO2]^2
From 3 to 2, there is 3 fold increase in [OH-], the initial rate increases 3 ...

Solution Summary

The expert examines rate laws and rate constants.