Answer to Question #110007 in General Chemistry for rita girgiss

Question

What is the molar concentration of Br− ions in a 0.230 M aqueous solution of FeBr3, assuming complete dissociation?

Answer 1

On complete dissociation, one molecule of $FeBr_3$ produces 1 $Fe^{3+}$

ion and 3 $Br^-$ ions.

Thus, 0.23 M aqueous solution of $FeBr_3$ produces $0.23*3=0.69 M$ of $Br^-$ ions.