Question

2) A buffer solution is prepared by dissolving Sodium Acetate and Acetic acid solutions. If the overall concentration of the solution is 0.2 M and the Ka for acetic acid is 1.74 x 105 (A) What is the buffer ratio? (B) What are the individual concentrations of Acetic acid and sodium acetate needed to prepare the buffer? PH = 5

Answer 1

@ pH = pka + log TCH₂ cool] Gіvеи ка = -74 xlo- 5 , PH = 5 CH3COONa] [Hom .PH = pka + dog = -logka + log Ich снасоога) - [сн;too~4] = - Доу (17%x165) + Log --les (74x16”) + 98 tен соон) = 4.759 + log fettzcoonte] [CH₂coon в Б4:154 , uztooмa). [ugook] о-241 = 11 mass . - [CH₃ Coona ] =1.74 # boa ZH₂200H] is bulten ratio = 1:74 6 overall concetration of the solution is 0.2m. . С оо] Сен оон1 = 1:14 [сн; шок) = 1-74[#ztоону Рҳаи L«н;toos ]t [и, соон) = 0-2 :. 1:14 Сензоон) + Сензоон] = 0.2 Сензоо] [ 1+1-747 = 6:2

[CH3 C004] = Dizu = 0.07299 M ... [CH₂ coona] = 0.2 [CH₃COOH] = 0.2 - 0.07299 = 0.1271 M. from this problem simply you can assume that a by vaning the butter ratio, pH of the site butter solution can be cleange.