Chapter 12.1, Problem 12.1P

The oxidation of iodide ion by arsenic acid, H₃AsO₄, is described by the balanced equation

$3{\text{I}}^{-}(aq)+{\text{H}}_3{\text{AsO}}_4(aq)+2{\text{H}}^{+}(aq)\to {\text{I}}_3{}^{-}(aq)+{\text{H}}_3{\text{AsO}}_3(aq)+{\text{H}}_2\text{O}(l)$

1. (a) If −Δ[I⁺]/Δt = 4.8 × 10⁻⁴ M/s, what is the value of Δ[I₃⁻]/Δt during the same time interval?
2. (b) What is the average rate of consumption of H⁺ during that time interval?