Enter the formulas of the compounds formed by specified cations with the following anions: OH-, HCO₃-, SO₃2-, and HPO₄2-. Part a ________. The cation NH₄⁺ with each of the following anions: OH- and HCO₃-. Express your answers as chemical formulas separated by commas. Use the given order of anions. Part B: The cation NH₄⁺ with each of the following anions: SO₃2- and HPO₄2-. Part C: The cation NH₄⁺ with each of the following anions: SO₃2- and HPO₄2-