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Acid Ka pKa HF 7.1 x 10-4 3.15 HNO2 4.5 x 10-4 3.35 HCOOH 1.7 x 10-4 3.77 C6H5COOH 6.5 x 10-5 4.19 CH3COOH 1.8 x 10-5 4.74 HCN 4.9 x 10-10 9.31 C6H5OH 1.3 x 10-10 9.89  Using the table, select appropriate acid/conjugate bases combinations and the proportions of each to prepare buffers at pH values of (i) 4.5 and (ii) 10.0

Acid Ka pKa HF 7.1 x 10-4 3.15 HNO2 4.5 x 10-4 3.35 HCOOH 1.7 x 10-4 3.77 C6H5COOH 6.5 x 10-5 4.19 CH3COOH 1.8 x 10-5 4.74 HCN 4.9 x 10-10 9.31 C6H5OH 1.3 x 10-10 9.89  Using the table, select appropriate acid/conjugate bases combinations and the proportions of each to prepare buffers at pH values of (i) 4.5 and (ii) 10.0

Fundamentals Of Analytical Chemistry
Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter9: Aqueous Solutions And Chemical Equilibria
Section: Chapter Questions
Problem 9.5QAP
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Question

Acid

Ka

pKa

HF

7.1 x 10-4

3.15

HNO2

4.5 x 10-4

3.35

HCOOH

1.7 x 10-4

3.77

C6H5COOH

6.5 x 10-5

4.19

CH3COOH

1.8 x 10-5

4.74

HCN

4.9 x 10-10

9.31

C6H5OH

1.3 x 10-10

9.89

 Using the table, select appropriate acid/conjugate bases combinations and the proportions of each to prepare buffers at pH values of (i) 4.5 and (ii) 10.0

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