Question 29 of 30 Map sapling earning The Ka values for several weak acids are g

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Question 29 of 30 Map sapling earning The Ka values for several weak acids are given below. Which acid (and its conjugate base) would be the best buffer at pH 3.7? O MES: Ka 7.9 x 10 O HEPES; Ka 3.2 x 103 O Tris; Ka 6.3 x 109 O Formic acid: K 1.8 x 10 O Acetic acid: K 1.8 x 10 Abbreviations: MES, 4-Morpholineethanesulfonic acid HEPES; 4-(2-Hydroxyethyl) piperazine-1-ethanesulfonic acid Tris, 2-Amino-2-hydroxymethyl-propane-1,3 -diol Previous 3 Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

for buffer solution pH = pKa (+/-) 1

for the given pH =3.7 the best buffer is formic acid

pKa of formic acid = 3.75 (which is best match with the given buffer pH)

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