Question 4 of 14 Sapling Learning Map marein learning The Ka values for several

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Question 4 of 14 Sapling Learning Map marein learning The Ka values for several weak acids are given below. Which acid (and its conjugate base) would be the best buffer at pH = 8.07 O Tris; K, 6.3x10 O Acetic acid; K 1.8 x10 MES%,= 7.9×107 Formic acid; Ka=1.8x104 HEPES O = 3.2% 10s Abbreviations: MES: 4-Morpholineethanesulfonic acio HEPES; 4-(2-Hydroxyethyl)piperazine-1-ethanesulfonic acid Tris; 2-Amino-2-hydroxymethyl-propane-1,3 -diol Exit Previous ® Give Up & View Solution 0 Cock Answer 0 Nect

Explanation / Answer

if we need

pH = 8

then

pKa = pH approx

so

pKa = 10^-pH = 10^-8

from the list

the best answer sill be

HEPES

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