pH = 10.31 Use the following table to predict the best acid/ base pair for the desired pH/pOH values below (hint: remember buffer range = ± 1 pKa unit). Acid Base     Name Acid Base pKa Hydrochloric acid HCl Cl- -7.00 Phosphoric acid H3PO4 H2PO4- 2.12 Hydrofluoric acid HF F- 3.18 Lactic acid Lactic acid Lactate 3.85 Acetic acid CH3COOH CH3COO- 4.74 Carbonic acid H2CO3 HCO3- 6.36 Dihydrogen phosphate H2PO4- HPO42- 7.21 Ammonium NH4+ NH3 9.25 Hydrocyanic acid HCN CN- 9.31 Bicarbonate HCO3- CO32- 10.25 Methylammonium ion CH3NH3+ CH3NH2 10.62 Hydrogen phosphate HPO42- PO43- 12.38

Introductory Chemistry For Today
8th Edition
ISBN:9781285644561
Author:Seager
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Chapter9: Acids, Bases, And Salts
Section: Chapter Questions
Problem 9.117E
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pH = 10.31

Use the following table to predict the best acid/ base pair for the desired pH/pOH values below
(hint: remember buffer range = ± 1 pKa unit).

Acid

Base

 

 



Name

Acid

Base

pKa

Hydrochloric acid

HCl

Cl-

-7.00

Phosphoric acid

H3PO4

H2PO4-

2.12

Hydrofluoric acid

HF

F-

3.18

Lactic acid

Lactic acid

Lactate

3.85

Acetic acid

CH3COOH

CH3COO-

4.74

Carbonic acid

H2CO3

HCO3-

6.36

Dihydrogen phosphate

H2PO4-

HPO42-

7.21

Ammonium

NH4+

NH3

9.25

Hydrocyanic acid

HCN

CN-

9.31

Bicarbonate

HCO3-

CO32-

10.25

Methylammonium ion

CH3NH3+

CH3NH2

10.62

Hydrogen phosphate

HPO42-

PO43-

12.38

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