J.7 textbook

[405745446]

Hi, the question reads:
Select an acid and a base for a neutralization reaction that results in the formation of: (d) potassium phosphate.
Can someone walk me through their reasoning on how they reached their answer? I've managed to get through a-c but am stuck on this last part.

[Lawrence Javelo Disc 3B]

So because this is a neutralization reaction, we know that a strong base and a strong acid are the reactants of this reaction. So because we have potassium phosphate, K3PO4, we can begin to build our reaction:

We have 3K+'s and 1 PO4 3-.

We know a strong acid with PO4 is H3PO4.
We know a strong base has OH in it so we can get KOH

Now we build our equation:
3KOH + H3PO4 --> K3PO4 +3H2O

Hope this helps!