Prairie View A & M Univer x c The Ka Values For Several x C WWW sapling learning

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Prairie View A & M Univer x c The Ka Values For Several x C WWW sapling learning.com /ibiscms/mod/ibis/view.php?id-1973899 O Not set A 48/100 9/4/2015 05:41 AM Gradebook Attempts Score Print Calculator Periodic Table Questi 20 of 27 Map e Ka values for several weak acids are given below. Which acid (and its conjugate base) would be the best buffer at pH 4.7? O Formic acid; Ka 1.8 x 10 O HEPES; Ka 3.2 x 108 O Tris: Ka 6.3 x10 O Acetic acid; Ka 1.8 x 10 20 O MES: Ka 7.9 x 107 Abbreviations MES, 4-Morpho neethanesulfonic acid HEPES; -ethanesulfonic acid 23 Tris; 2-Amino-2-hydroxymethyl-propane-1,3 -diol 24 25 26 Previous Give Up & View Solution Check Answer Next Exit 27 pyright 20 2015 Sapling Le 58 tact a Search the web and Windows Assignment Information Available From 8/24/2015 06:00 PM Due Date Set Points Possible 100 Grade Category: Graded Description: Policies: Homework heck y n view solutions when you complete o up on any question n keep trying to answer each question u you get it right or give up You lose 5% of the points available to each answer each incorrect attempt at that in your question O eTextbook OHelp With This Topic Web Help & Videos O Technical Support and Bug Reports 33 PM 9/8/2015

Explanation / Answer

answer is acetic acid

p^H = P^Ka + log[salt]/[acid]

always in buffer [acid] = [salt]

p^H = P^Ka

4.7 = p^Ka

4.7 = -log(Ka)

Ka = 1.8*10^-5

it is the value of acetic acid

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