Question

What is the formula of the compound formed when ammonium ions, `NH_4 ^+`, and phosphate ions, `PO_4^(3-)` combine?

Answer 1

`(NH_4)_3PO_4`

Explanation:

This is because `NH_4^(+)` has a charge of 1+, and `PO_4^(3-)` has a charge of 3-. The compound should have a neutral charge, so it takes three `NH_4^+` to balance out `PO_4^(3-)`.