Question

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A 0.25 M NaA solution has a pH of 9.25 at 25°C. Calculate the pK value of HA. Calculate the equilibrium concentration of H,CO, and HCO," in 1.0 M Na, Co, at 25°C.

Answer 1

( 1900, Қии s», (ъ) = 2 лог" ( ) -- ,“ (%). o,-(4) --№o (2) = н-со, (ел) --он - K. - [ Hz] [OH-] *b = log2-1 H-о, (4) --№o (1) ғ ң (м)-он ( ) ке, = ә L4, 31 Lov) Less ). I we know the acid dissociation constant (ka) . „P, ch 2° 8 К. = 4 x 10 * - Юг Клоо. К = ко КА, * = Ко | Қа, Кь, 2 КГ. Кь, = Low to 4. xls 7 1 4, 7x16 1) - сто Ко, = 4:7х10 11 . 1 ) 1 L» О - 1-ох 10-14 22. 2 x 108 = 2 • Х/ 00) = = 2.1 x 10 4 кр = Lo1 Гон-1 [ cop 2- (+6, 1=(он) | o - L+cos 11 [о,* 1 , x ). У 1-а, 7= 2 x 164, Scanned with QUAD CAMERA Scaniter int on replnes Scrates а о, о 14 м.

o Siani Carly! Кр, = 4 ] Го с7 * = 2 2 х/6- 8. Luo 1 L4 1-2-2415 8 o o4. - 2» (9x16 Corcenfentica zliz cog] = 0.00001 M. Scanned with CamScanner

o. Salt: NaA. ? We consider i we consider this salt strong base Nooh acid HA. come from the and weak 2. So, the pH formula of the hydrolysis of this salt ise pH = b pkw - 1 / 3 pkatte roge. +9:25 = 22x24 + ₂ pka et 20g (0.25) tipka = 2:19.25 -7 12 20g (0.28) 312 [9.255-7+0:30] = 2 x 255 a = siul, I tol, so the pka of, HA =sit. CS Scanned with CamScanner
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