Core
Reactions: Redox
Slide 15 of 42
Determination of oxidation state
However,
knowing these oxidation states, those of other atoms in a compound
or ion can be determined very easily.
Determine
oxidation state of
a) S in SO2,
(S) + 2 (O) = 0
(S) + 2 (-2) = 0
(S) = + 4
b) C in CH3O,
(C) + 3 (H) + (O) = 0
(C) + 3 (1) + (-2) = 0
(C) + 3 -2= 0
(C) + 1= 0
(C) = -1
c) N in NH4+
(N) + 4 (H) = +1
(N) + 4 (1) = + 1
(N) = -3
d) Cr in Cr2O7 –2
2 (Cr) + 7 (O) = -2
2 (Cr) + 7 (-2) = -2
2 (Cr) = -2 + 14
Cr = 6