A solution of Fe(NO3)3 (aq) and a solution of KIO3 (aq) are mixed and a white precipitate forms. (IO3 is a polyatomic ion much like ClO3)

Question

What is the formula of the precipitate? Explain your reasoning.

Answer 1

Fe(IO₃)₂ is the formula of the precipitate. The reasoning is that all other possible species are soluble and since IO₃ has a negative 1 charge it will require 2 such ions to balance the +2 Fe cation.