Which of the following equations represents the proper net ionic equation for the precipitation of an insoluble hydroxide compound from Al(NO3)3(aq) and KOH (aq)?
1) 3 KOH (aq) + Al(NO3)3(aq) ----> 3 KNO3 (aq) + Al(OH)3 (s)
2) KOH (aq) + NO3- (aq) ----> KNO3 (s) + OH- (aq)
3) NO3- (aq) + K+ (aq) ----> KNO3 (s)
4) 3 OH- (aq) + Al(NO3)3(aq) ----> Al(OH)3 (s) + 3 NO3- (aq)
5) 3 OH2- (aq) + 2 Al3+ (aq) ----> Al2(OH)3(s)
6) Al3+ (aq) + 3 OH- (aq) ----> Al(OH)3(s)
7) K+ (aq) + (NO3)2- (aq) ----> K(NO3)2 (s)
8) KOH (aq) + Al(NO3)3(aq) ----> K(NO3)3 (aq) + AlOH (s)
9) Al+ (aq) + OH- (aq) ----> AlOH (s)