Question

1. A 2.03 M solution of a weak acid HA is found to have a pH of 2.10. Determine K, of the acid Determine Kb of its conjugate base, A Determine (OH') in a 2.00 M solution of the weak acid's sodium salt, NaA M Determine the pH of a 2.00 M solution of the sodium salt, NaA

Answer 1

I HA H+ + A² Thitally c O o after coca ca ca " pH = 2.10 [H+] = +25x' = 7.9x10-5 c. = 7.9x10-5 2.030 = 7.9x10-3 x = 7.9 x 10-3 2.03 x = 3.8 gx10 [dissociation constant] (1) Ka = [ca][ca] [c-ca] (2 & 2 Cl1-2] ka = caz = 2.03X 15.1 3x10-6 Ka = 30 71 x 10-6 3
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сі) куках k, Ko= kw - 10-14 Ka 30.71810-6 = 0.032x10-8 kb=3.2 x 10-10 (iii) for this buffer solution pH = pkA et log [salt] (Acid] PKA=4.51 PH - 4.51 t logo = 4.51 - 614X10-3 = 4:51 -0.0064 bH & 4.5036