What would be ionic and net ionic equation for?

Question

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

and

HClO4 (aq) + Mg(OH)2 (s) ----> Mg(ClO_4)_2 (s) + 2H_2O

Answer 1

The first reaction is written incorrectly. This reaction is interesting in that actually produces no spectator ions. The Ba3(PO4)2 should be written as a solid, due to it being insoluble.

Ba(OH)2 and H3PO4 are both weak and do not dissociate/ionize in water readily. These should be kept together.

So both reactions could be written as:
3Ba(OH)2 (aq) + 2H3PO4 (aq) ---> Ba3(PO4)2 (s) +6H2O (l)

For this reaction again is incorrect.
Mg(ClO4)2 (s) should be (aq). It is highly soluble.

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

Perchloric acid is a strong acid and completely ionizes in water
complete ionic
2H+(aq) + ClO4-(aq) +Mg(OH)2(s) --> Mg2+(aq) + 2ClO4-(aq) +2H2O(l)

net ionic
2H+(aq) + +Mg(OH)2(s) --> Mg2+(aq) +2H2O(l)

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Answer 2

In terms of ions, for the first eqtn, the "cast" is
Ba+2, OH-, H+ and PO4-3. With this you should peice together the equations, which are
"base" + "acid" -> salt (base anion/acid cation)+ water.