In: Chemistry
a) The molecular equation taking place is
HBr (aq) + NH3 (aq) ------> NH4Br (aq)
The complete ionic equation is
H+ (aq) + Br- (aq) + NH3 (aq) --------> NH4+ (aq) + Br- (aq)
Cancel out the common ions from both sides and write the net ionic equation as
H+ (aq) + NH3 (aq) -------> NH4+ (aq)
b) The molecular equation taking place is
2 H3PO4 (aq) + 3 Ba(OH)2 (aq) --------> Ba3(PO4)2 (s) + 6 H2O (l)
The complete ionic equation is
6 H+ (aq) + 2 PO43- (aq) + 3 Ba2+ (aq) + 6 OH- (aq) --------> Ba3(PO4)2 (s) + 6 H2O (l)
The net ionic equation is the same as the complete ionic equation, since there are no common ions on both sides.