1.Chlorine gas is bubbled through an aqueous solution of sodium iodide. 2.Barium hydroxide is used to neutralize sulfuric acid. Ba(OH)2(aq) + H2SO4(aq) -> BaSO4(s) + H2O(aq) Ba(aq) + 2OH(aq) + SO4(aq) -> BaSO4(s) + O(aq) 1.The reason im having trouble with this equation is because of the chlorine gas. On the Qualitative Solubility Rules, it dosen't state anything about gases so I dont know if it will form precipitate or just soluble. 2. for number two can someone just confirm me if i did the equation right?(I didnt add the charges because I couldn't) edit: oh one more thing. theres another question that states a iron nail was added to sulfuric acid...how do i know if iron is 2+ or 3+?