3Formulas of AcidsAn acid is a substance that when dissolved in water, dissociates or breaks apart into a hydrogen ion (H+) and an anion.Acids always have hydrogen as the first element in the formula,HCl (aq), HNO3 (aq), H2SO4 (aq), etc.
4Naming Binary AcidsBinary acids contain only two elements, hydrogen and a monatomic anion whose name ends in the suffix -ide.To name a binary acid like HClBegin the name with the prefix hydro-Next use the root of the second elements name, e.g. chlorReplace the suffix of the anion with the suffix -icAdd the word acidHCl is hydrochloric acid
6Ternary AcidsTernary acids contain three elements, with hydrogen being the first element in the formula and oxygen being the last.To name a ternary acid such as H2SO4Remove the hydrogen ion(s) and determine the formula of the anionReplace the suffix-ate becomes -ic acid-ite becomes -ous acidH2SO4 anion SO42- sulfuric acid
7Polyatomic Ions NH4+ PO43- CO32- SO42- ClO- SO32- ClO2- CN- ClO3- NO3- Have you memorized the polyatomic ions yet?NH4+ammoniumPO43-phosphateCO32-carbonateSO42-sulfateClO-hypochloriteSO32-sulfiteClO2-chloriteCN-cynaideClO3-chlorateNO3-nitrateClO4-perchlorateNO2-nitriteOH-hydroxideC2H3O2-acetate