A. the chemical formula for the base calcium (II) hydroxide is Ca(OH)2. B. the formula for selenic acid H2SeO4. C. HNO3 = nitric HNO2 = nitrous HCl = hydrochloric HClO3 = chloric Solution A. the chemical formula for the base calcium (II) hydroxide is Ca(OH)2. B. the formula for selenic acid H2SeO4. C. HNO3 = nitric HNO2 = nitrous HCl = hydrochloric HClO3 = chloric.