Problem: The following set of data was obtained by the method of initial rates for the reaction:BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l).What is the rate law for the reaction?Expt               [BrO3-] (M)                 [Br-] (M)                     [H+] (M)                   Rate (M/s)1                      0.10                            0.10                            0.10                            8.0x10-42                     0.20                           0.10                           0.10                            1.6x10-33                     0.20                           0.15                           0.10                            2.4x10-34                     0.10                             0.10                           0.25                            5.0x10-3a.  rate = k[BrO3-][Br-][H+]b.  rate = k[H+]2c. rate = k[BrO3-][Br-][H+]2d.  rate = k[BrO3-][Br-]e.  rate = k[BrO3-]2[Br-]2[H+]2

FREE Expert Solution

We're being asked to determine the rate law for the reaction given the following initial rate data:

BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l).

Expt               [BrO3-] (M)                 [Br-] (M)                     [H+] (M)                      Rate (M/s)
1                      0.10                            0.10                            0.10                            8.0x10-4
2                      0.20                            0.10                            0.10                            1.6x10-3
3                      0.20                            0.15                            0.10                            2.4x10-3
4                      0.10                            0.10                            0.25                            5.0x10-3


Recall that the rate law only focuses on the reactant concentrations and has a general form of:

rate law=k[A]x[B]y[C]z

k = rate constant
A, B, and C = reactants
x, y, & z = reactant orders


To calculate the order of the reaction with respect to each reactant, we will use the experimental data given. 

• BrO3-

Look for the experimental data where the concentration of BrO3- changes while the concentration of the other reactants remains the same.

View Complete Written Solution
Problem Details

The following set of data was obtained by the method of initial rates for the reaction:

BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l).

What is the rate law for the reaction?

Expt               [BrO3-] (M)                 [Br-] (M)                     [H+] (M)                   Rate (M/s)
1                      0.10                            0.10                            0.10                            8.0x10-4
2                     0.20                           0.10                           0.10                            1.6x10-3
3                     0.20                           0.15                           0.10                            2.4x10-3
4                     0.10                             0.10                           0.25                            5.0x10-3


a.  rate = k[BrO3-][Br-][H+]
b.  rate = k[H+]2
c. rate = k[BrO3-][Br-][H+]2
d.  rate = k[BrO3-][Br-]
e.  rate = k[BrO3-]2[Br-]2[H+]2

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Rate Law concept. You can view video lessons to learn Rate Law. Or if you need more Rate Law practice, you can also practice Rate Law practice problems.