1. Find the equilibrium constant for the reaction of BICINE (use the p K a value
ID: 945967 • Letter: 1
Question
1. Find the equilibrium constant for the reaction of BICINE (use the pKa values for common buffers table) with just one equivalent of NaOH.
2. What is the equilibrium constant for the reaction between methylamine and HCl? (Assume Ka = 2.33???10?11, and Kw = 1.01???10?14.)
TABLE 9-2 (continued) Structures and pK, values for common buffersobcd ab,cd TABLE 9-2 (continued) pKa (pAJAT Formula mass Name Structure -0.1 M sulfonic acid (ACES) 6.85 6.75 182.20 -0.018 OH 3-(N-Morpholino)-2-hydroxy- propanesulfonic acid (MOPSO) CHCHCH,So 6.90 225.26 -0.015 Imidazole hydrochloride HN 6.99 7.00 04.54 -0.022 .Cl 7.14 (pK2) 7.18 7.20 (pK2) 6.93 7.08 6.71 7.48 02.37-0.007 209.26 -0.012 98.00-0.002 223.29 PIPES (see above) 3-(N-Morpholino)propanesulfonic CH,CH,CH,so acid (MOPS) Phosphoric acid 4-(N-Morpholino)butanesulfonic H,PO acid (MOBS) N-Tris(hydroxymethyl)methyl-2- HOCH2,CNH,CH2CH2SO HOCH,CH,N (see above) HOCH 7.60 7.49 7.97 7.87 229.25 -0.019 238.30 -0.012 330.42 52.33 -0.013 7.55 aminoethanesulfonic acid (TES) N-2-Hydroxyethylpiperazine-N'-2- 7.56 ethanesulfonic acid (HEPES) PIPPS N-2-Hydroxyethy!piperazine-N'-3- (pk2) HCH2So3 7.96 propanesulfonic acid (HEPPS) 8.04 10.54 Glycine amide hydrochloride Tris(hydroxymethyl)aminomethane HNCH,CNH,C 8.07 8.14 (NH) 8.26 (NH) 8.33 (NH) 8.10 157.60 -0.028 79.17 -0.018 132.12 -0.026 163.17 -0.015 C (HOCHCNH (see above) (see above) (see above) hydrochloride (TRIS HCI) TRICINE 8.09 BICINE 8.22Explanation / Answer
2)
H3O+(aq) + Cl-(aq) + CH3NH2(aq) --> CH3NH3+(aq) + Cl-(aq) + H2O(l)
as the Kh( hydrolysis constant is given by ) = Kw/Ka
= 1.01 * 10-14 / 2.33 * 10 -11
= 0.43 * 10 -3
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