3. Shewanella putrefaciens is a microorganism that can get energy by reducing U6+ to U4+; U(VI) is soluble and can be transported in solution, often as a uranyl-carbonate complex. U(IV) is fairly insoluble and forms a uraninite species, UO2 (s), most uranium ores are of this form), so the oxidation state of uranium is important for determining the mobility of uranium in surface and ground waters. One reaction that has been studied extensively is: 0.500,(C0z) +H* + e 0.5UO2 uraninite 1.5HCO, b) Calculate the Eh for this reaction for the following conditions: pH = 5.7, UO2(CO3)34+ = 10-5 mol L-', and HCO3 = 5.5 x 10-3 mol L ', activity of UO2(s) = 1 At equilibrium (activity = concentration) 15 pts