What the oxidation states of #"ferric ion"# or #"ferrous ion"#?

1 Answer
Jul 8, 2017

Answer:

When the oxidation state of the metal is #+II# or #+III#......

Explanation:

#"Ferric"#, #Fe^(3+)#, and #"ferrous"#, #Fe^(2+)# species are common........For any formula, it useful to be able to quickly assign the oxidation state........

#1.# #"The oxidation number of a free element is always 0."#

#2.# #"The oxidation number of a mono-atomic ion is equal"# #"to the charge of the ion."#

#3.# #"For a given bond, X-Y, the bond is split to give "X^+# #"and"# #Y^-#, #"where Y is more electronegative than X."#

#4.# #"The oxidation number of H is +1, but it is -1 in when"# #"combined with less electronegative elements."#

#5.# #"The oxidation number of O in its"# compounds #"is usually -2, but it is -1 in peroxides."#

#6.# #"The oxidation number of a Group 1 element"# #"in a compound is +1."#

#7.# #"The oxidation number of a Group 2 element in"# #"a compound is +2."#

#8.# #"The oxidation number of a Group 17 element in a binary compound is -1."#

#9.# #"The sum of the oxidation numbers of all of the atoms"# #"in a neutral compound is 0."#

#10.# #"The sum of the oxidation numbers in a polyatomic ion"# #"is equal to the charge of the ion."#

And so for iron complexes and salts such as #Fe_2(CO)_9#, #FeCl_3#, #Fe(NO_3)_2#, can you suggest an oxidation state?