Which of the following equations represents the proper net ionic equation for the complete neutralization reaction between the strong base Ba(OH)2 (aq) and the strong acid HI (aq)?
1- HI (aq) + OH- (aq) ----> H2O (l) + I- (aq)
2- 2 HI (aq) + Ba(OH)2 (aq) ----> 2 H2O (l) + BaI2 (aq)
3- 2 I- (aq) + Ba2+ (aq) ----> BaI2 (aq)
4- 2 H+ (aq) + (OH)2- (aq) ----> 2 H2O (l)
5- 2 H+ (aq) + Ba(OH)2 (aq) ----> 2 H2O (l) + Ba2+ (aq)
6- 2 H+ (aq) + Ba2+ (aq) ----> H2Ba (aq)
7- I- (aq) + OH- (aq) ----> IOH (aq)
8- H+ (aq) + OH- (aq) ----> H2O (l)