1. (10\%) (a) For an open carbonate system, write the equilibrium equations for the reactions between carbonate species with pCO2,pKH,pKa1, and pKa2. Then convert the equations into logarithmic forms. Assume pCO2=0.35atm. (b) In wastewater treatment plants, there is a process called the anaerobic digestion (AD). In AD reactors, the head space is filled with biogas that contains 35% of CO2 (i.e., pCO2=0.35atm ). Determine the expected pH of the wastewater in AD reactors if its alkalinity is zero (which is not in real reactors) by completing the logCpH diagram for open carbonate systems