Problem Set #6 – Redox Reactions Due Wednesday March 23, before class (1) Surface seawater has a pH of 8.2 and the following redox couples present: a) O2 at a pressure of 0.21 atm and water b. N2 at a pressure of 0.76 atm and NO3- at a concentration of 4 x 10-5 m c. CO2 at a pressure of 3 x 10-4 atm and CH4 at a pressure of 1.5 x 10-6 atm Assuming T = 25º C, what pe does each couple define? Are they the same as each other? What do you think are the reasons for the discrepancies? (2) Construct a pe-pH diagram for the system Mn-O-H2O, considering Mn2+ and the phases of MnO2 (birnessite), Mn2O3, Mn3O4, and Mn(OH)2 (pyrochroite).
Pages to are hidden for
"Homework #4 � Using PHREEQ"Please download to view full document