Solve for A and B Pyridine is a weak base that is used in the manufacture of pes

Question

Solve for A and B 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: Constants I Periodic Table The pK, of pyridine is 8.75. What is the p of a 0.355 M solution of pyridine? (Assume that the Unlike strong acids and bases that ionize completely in solution, weak acids or bases partially ionize. The tendency of a weak acid or base to ionize can be quantified in several ways including temperature is 25 °C.) Express the pH numerically to two decimal places. View Available Hint(s) K.or . and percent ionization* This assumes that species of equal concentrations are being compared as percent ionization is affected by concentration. 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. Banzoic acid ionizes in water The pK, of this reaction is 42. In a 0.76 M soluton 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)

Explanation / Answer

C5H5N + H2O ----------------> C5H5NH^+   + OH^-

Pkb   = 8.75

C    = 0.355M

POH   = 1/2Pkb -1/2logC

           = 1/2*8.75-1/2log0.355

            = 4.375 -1/2*-0.4497

            = 4.375+ 0.22485

            = 4.6

PH    = 14-POH

           = 14-4.6 = 9.4

part-B

                C6H5COOH ------------------> C6H5COO^- + H^+

             Pka = 4.2

              C   = 0.76M

       PH = 1/2 Pka -1/2logc

              = 1/2*4.2 -1/2log0.76

               = 2.1 -1/2*-0.1191

              = 2.1+0.05955

               = 2.2

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