Question

Please answer both 24 & 27

22. Calculate the pH of a 0.0120 M lactic acid solution. HC3H5O3, K = 1.36x10 23. Find the pH of 0.388 M lithium butanoate solution, LIC,H,O,(aq). Butanoic acid Kg = 1.52x10° 24. Calculate the percent ionization for a 0.0240 M hypochlorous acid solution. The K, for hypochlorous acid is 3.4x10 25. Nicotine is a weak base (C10H24N2, Kb = 1.0x10'). A researcher prepares a solution containing 0.300 M nicotine and 0.050 M NaOH. Determine the concentration of monoprotonated nicotine, (C10H24N2H', the conjugate acid) in the solution.

22. Calculate the pH of a 0.0120 M lactic acid solution. HC3H5O3, K = 1.36x10 23. Find the pH of 0.388 M lithium butanoate solution, LIC,H,O,(aq). Butanoic acid Kg = 1.52x10° 24. Calculate the percent ionization for a 0.0240 M hypochlorous acid solution. The K, for hypochlorous acid is 3.4x10 25. Nicotine is a weak base (C10H24N2, Kb = 1.0x10'). A researcher prepares a solution containing 0.300 M nicotine and 0.050 M NaOH. Determine the concentration of monoprotonated nicotine, (C10H24N2H', the conjugate acid) in the solution.

Answer 1

Answer

24 percent - .. Ionisation is donisation given by the expression = x x 100 of. THAT where (HA) = aid concentration and x e concentration of 4t ions at equilibrium Calluktion of Helo - H+ + cao - I 0.0240 KO =X tx E 0.0240 - +x + X ka = x (x2 ( 0 0 240 - Here x = [H + 2 3.4 x 10 8 1 = x2 0.0 240 0.0816 x 100 = x2 Accc0.0240, so neglected in the denominator 10.285 X 10 M = x % Ionisation X 100 = 0.285 XIGM M 0.0240 M 0.285 x 16 - 240 X oth 0.11875 % & 0.12 % X 100