Question

Please explain in words and in equations

(15 pts) Calculate the pH and the concentration of all the species present at equilibrium for a 1.0E-4 M carbonic acid solution. Ka1: 4.20E-7 Kaz: 4.80E-11 Tulak ach 14.202-7=CACIBOT J A - + H-0)

Answer 1

page:01 Answers problem, According to the given to calculate the pH. Given, Kaia 4. roxot kaq 3 4080 x 10" cabonic acid - 10x10 4M Now, the carbonic acid is tocog. :. 2t is diprolic acid means it giver ut -The Ice Hable es, H9C03(09) 0.0001M Htaw HCO3(aq). 0 0 : initiat 501-7M Equalibrium then, Kai a [HT? [HCog] {HaCo3] coax07 - x x H 10.0001-21)

page: 0a Here, neglet x on the bottom. Since Ka is very low. 80. uaxlo7. De 0.0001 4. ax 107(0.0001):71 taulaxio" X 6418 X166 then, Hg Coqi 0.0001 - 2 a l'OX164 – 6.48X106 Haloz. - 9.35 XÓSM and, [ist] - [H Cost] - Giugxios H NOW, HCozcaq) == 6.48X106 :: GouesX166-X aq) + Cogle Camu? 6. u8xido o initial Gug xi@ +3 fl equolibrium

page:03 then, Kaq : [4+][cost] CHIcoz] 4468x10'' (6.48X1ŐS + x 1 (648X106-707 Here, neglet x on the both of these. (6.48 x16+u), (sousxlőb-22) Since, : Ka is very low. 80, 4.8 X10 then, [coger) = 44.8x16"'M [HCO3) = GUBxc3 6M CH+] = 6.48X166 therefore, pH = -log[ht] -- 10g[6•uş x166) 1. PH : 5019