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CH3041
ON-LINE LECTURE 7
REDOX CHEMISTRY
Redox reactions are
important in aquatic
systems: some examples
systems: some examples
NH4+ + 2O2(g) ® NO3- + 2H+ + H2O algae use NO3-
• Many of the most important redox
reactions
are catalysed by microorganisms.
are catalysed by microorganisms.
Reduction Fe(III)(s) ® Fe(II)(aq) Bacteria DG
-114 kJ/ mol
{CH2O}
+ 7CO2(g)+ 4Fe(OH)3 ® 4Fe2+ + 8HCO3- + 3H2O
• Often acid-base
(H+ transfer) & redox
processes occur at the same time in water.
processes occur at the same time in water.
Fe(H2O)62+ D Fe(OH)3(s) + 3H2O + 3H+
{CH2O} + O2(g) ® CO2(g) + H2O excess depletes O2
