reaction rates

I'm probably overcomplicating this but I'm hung up on a chemistry problem. Say the hydrolysis of a chemical proceeds in two steps as follows: P3O105- + H2O > P2O74- + PO43- + 2H+ P2O74- + H2O > 2PO43- + 2H+ The respective reaction rates are k1 = 2.3E-6 s-1 and k2 = 1.0E-6 s-1. These...