Question

The following initial rate data are for the oxidation of arsenate ion by cerium(IV) ion in aqueous solution:

AsO₃^3- + 2 Ce⁴⁺ + H₂OAsO₄^3- + 2 Ce³⁺ + 2 H⁺

Experiment	[AsO33-]o, M	[Ce4+]o, M	Initial Rate, M s-1
1	3.28×10-2	0.362	2.38×10-3
2	6.56×10-2	0.362	4.76×10-3
3	3.28×10-2	0.725	9.55×10-3
4	6.56×10-2	0.725	1.91×10-2

Complete the rate law for this reaction in the box below.
Use the form k[A]^m[B]ⁿ , where '1' is understood for m or n and concentrations taken to the zero power do not appear. Don't enter 1 for m or n.

Rate =

From these data, the rate constant is M^-2s^-1.