The acids which contain polyatomic ions are also eash to decipher. Nitric acid contains the nitrate ion (NO3-) which will combine with one hydrogen (H+) to make HNO3. Sulfuric acid contains the sulfate ion (SO4=) which will combine with two hydrogen atoms to make H2SO4. Phosphoric acid contains the phosphate ion (PO4^3-) and three hydrogen atoms (H3PO4).