Question 1 - (50 points) Typical seawater pH is 8.1. Seawater is in equilibrium with atmospheric CO2. = More data: Kc1 = 106.35, Kc2 = 10 10,33 Ksp (CaCO3) = 8.9*10 Hco2 = 29.4 bar/M, Pcoz in atmosphere is 400e-6 bar For seawater, you can assume (Ym=0.6 and 7:=0.1) = a. Calculate the H2CO3 concentration in the seawater (10 points) b. Calculate the AlkH2CO3* in the seawater (10 points) C. (Ca+] is 450 mg/l. Determine the SI of CaCO3(s). (10 points) d. Atmospheric CO2 concentration is increasing due to the use of fossil fuels. In addition to global warming, elevated CO2 level will cause a decrease in ocean pH. What is the increased atmospheric Pcoz that would cause a decrease of 0.3 pH units (to pH 7.8)?. (10 points) e. A sharp decrease in ocean pH will de-supersaturate CacO3, which may harm different microorganisms and affect the ocean eco-system. At which pH will Slcacos = 0