The reaction below was carried out in an acidic solution. Upper i minus, plus upper i upper o minus subscript 3 right arrow upper i subscript 2. Which statement is true about this equation? although it is unbalanced, it can be balanced by using the half-reaction method. It has been balanced by using the half-reaction method. It has been balanced by directly using spectator ions. Although it is unbalanced, it can be balanced by directly using spectator ions.