J.R. S. answered 10/11/22
Ph.D. University Professor with 10+ years Tutoring Experience
Fe(NO3)3*9H2O(s) + H2O(l)
There really isn't a "reaction" per se. Essentially, the Fe(NO3)3 dissociates into the constituent ions and dissolves.
Fe(NO3)3(s) ==> Fe3+(aq) + 3NO3-(aq)