Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows: C5 H5N(aq) + HO(l) = C5H5NH+ (aq) + OH(aq) The pK of pyridine is 8.75. What is the pH of a 0.210 mol L- solution of pyridine? Express the pH numerically to two decimal places. View Available Hint(s) B pH Submit Part B Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOH(aq) + HO(1) C6H5COO(aq) + H3O+ (aq) The pK of this reaction is 4.2. In a 0.69 mol L- solution of benzoic acid, what percentage of the molecules are ionized? Express your answer to two significant figures and include the appropriate units. View Available Hint(s) A ? percent ionized = Value Units Submit