What is the Name for PbHPO4?

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1 Answer
Stefan V.
May 8, 2015

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.

![www.chemistry.wustl.edu)

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#.

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