Complete and balance the following equations:

1. NaOH _(aq) + H₂SO_{4 (aq)}

2. HCl _(aq) + NaHCO_{3 (aq)}

3. Na₂CO_{3 (aq)} + HBr _(aq)

4. HNO_{3 (aq)} + KHCO_{3 (aq)}

5. HBr _(aq) + NH_{3 (aq)}