Question

For the diprotic weak acid H.A, K = 3.2 x 10 and K2 = 8.7 x 10-'. What is the pH of a 0.0550 M solution of H, A? pH = What are the equilibrium concentrations of H, A and A?- in this solution? [HA] = A-1 =

Answer 1

Ginsen - a disgotic _ocid. of OOSSOM Solution . Reaction- HOA olosso-x. Ka = 3.2460 WA xay + 4+ xay 8 eb : kar-8.7+209 HA AP- & ret may il y xty. at eab. Now, kay. (x+y) (x-7) 10:0SS02 - and Kag. 5 lty) (y) i (2-4) The kabi ja 10-G order 30, o wie negligible in front oforosso. and also, kaan kas so y u negligible infront of no je. x+ y X , 2-y = x , so kar- Ge) and fras xx 0.055o Now, we know that Rhe lagfrt)

_Db_2_-Jas [x+y] - laget by ean. - 0.0550 x kad o osso *.3.2x286 1.76 *10-7 z? n = 4.19 x 104 Oh 1 - log(419 lov ) 24 - Jag 4:19 Ph= 3.377 Now, equilibrium. CHIA] at the = 0.0550 - X ~ 0.05so so we can say that CroAl at equilibrium will be approximately Dossom Now, CAR-] ay by ean. ty-kaz

.مز 109 + 9 8 = So, کا -7
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