writing formulas for compounds chart Writing Formulas for Compounds Chart for Discussion Question lonic Molecular Polyatomic Polyatomic Acid/ Strong Binary/ Roman Na Prefix Cation Base Acid/Base oxyacid Num Anion NaOH SnCl HNO, H SO PCl, Solution CuSO 4 Ionic : Cu SO 4 ; Cu 2+ , SO 4 2- Molecular prefix : Cu 1 SO 4 polyatomic cation : Cu 2+ polyatomic anion : SO 4 2- salt of strong acid H 2 SO 4 so it will be strong acid, oxyacid (since it has oxygen) HCl Ionic : HCl, H + Cl - molecular prefix : H 2 Cl 2 polyatomic cation : H + polyatomic anion : Cl - HCl is strong acid and it is binary acid. .