Would Ti3(PO4)2 be

titanium phosPHATE
or phosPHIDE

5 answers

phosphate is correct. phosphide is for binary compounds only; i.e., HCl is hydrogen chloride, Mg3P2 is magnesium phosphide, HI is hydrogen iodide, Mg3N2 is magnesium nitride.
The phosphate ion is PO4^3-
The phosphite ion is PO3^3-
The phosphide ion is P^3-
So i only use IDE for binary compounds only?
right.
That's where you get sodium chloride for NaCl. Potassium bromide for KBr.
What would KOH be?
potassium hydroxide. The OH^- is the hydroxide ion.