What compound forms between #Fe^(3+)# and #SO_4^(2-)#? What is its name?
The first thing to note here is that the compound that contains the
This means that the overall positive charge coming from the cations must be balanced by the overall negative charge coming from the anions.
In this case, you will need two
#color(red)(2)"Fe"^color(blue)(3+) + color(blue)(3)"SO"_ 4^color(red)(2-) -> "Fe"_ color(red)(2)("SO"_ 4)_ color(blue)(3)#
Now, in order to name this compound, you must use the fact that iron is a transition metal, which implies that it can form more than one cation.
In order to show that the iron cation carries a
#"Fe"^(3+) ->#the iron(III) cation
The (III) Roman numeral shows that the cation carries a
#"Fe"_ 2("SO"_ 4)_ 3 ->#iron(III) sulfate