Question

What is the Name for PbHPO4?

Answer 1

Actually, that compound is lead (II) hydrogen phosphate, not lead (IV) hydrogen phosphate.

Notice that it contains the hydrogen phosphate anion, `HPO_4^(2-)`, which carries a 2- charge.

This implies that the lead cation is in a +2 oxidation state, so you're actually dealing with the lead (II) cation, `Pb^(2+)`.

As a result, the correct name for `PbHPO_4` is lead (II) hydrogen phosphate.

Lead (IV) hydrogen phosphate will have the lead cation in a +4 oxidation state, so you'd be dealing with the lead (IV) ion, `Pb^(4+)`.

As a result, lead (IV) hydrogen phosphate would be

`Pb_2(HPO_4)_4`, or `Pb(HPO_4)_2`.