Formula that contains K+ and PO4-3
To find this formula, we need to exchange the oxidation states:
[tex]K_3PO^{}_4\Rightarrow3K^++PO^{-3}_4[/tex]
The charge of the compound has to be 0.
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Let's see:
K+ is a cation.
PO4-3 is an anion.
These ions are from this compound K3PO4, a salt.
When a salt ionizes, it gives anion and cation.
Anion and cation are ions.
