Molecular equation help?

Question

How do you complete these equations?

*There should be a plus sign in all after the first (aq), it might not post.

1. HBr(aq) NH3(aq) ---->

2. Ba(OH)2(aq) H3PO4(aq) ------>

3. HClO4(aq) Mg(OH)2(s) ------->

Answer 1

1. HBr(aq) + NH3(aq) ===> NH4Br(aq)

2. 3Ba(OH)2(aq) + 2H3PO4(aq) ===> Ba3(PO4)2(s) + 6H2O

3. 2HClO4(aq) + Mg(OH)2(s) ===> Mg(ClO4)2(aq) + 2H2O

Answer 2

HBr(aq) + NH3(aq) --> NH4Br (aq)

3Ba(OH)2(aq) + 2H3PO4(aq) -->  Ba3(PO4)2(s)* + 6H2O(l)

2HClO4(aq) + Mg(OH)2(s) --> Mg(ClO4)2(aq) + 2H2O(l)

* Barium phosphate is sparingly soluble so may or may not appear asa precipitate.