TABLE 16.3 Acid-Dissociation Constants of Some Common Polyprotic Acids Name Formula K1 K2 Ascorbic H2CH¿O6 8.0 x 10-5 1.6 x 10-12 Carbonic Н.СО, 4.3 x 10-7 5.6 x 10-1" Citric H;C,H5O7 7.4 x 104 1.7 x 10-5 4.0 x 107 Охalic HOOC-COOH 5.9 x 10-2 6.4 x 10-5 Phosphoric Н,РО, 7.5 x 10-3 6.2 x 10-8 4.2 x 10-13 Sulfurous H,SO, 1.7 x 10 2 6.4 x 108 Sulfuric H2SO4 Large 1.2 x 10-2 Tartaric С-Н.О,(СООН)2 1.0 x 10- 4.6 x 10-5

General, Organic, and Biological Chemistry
7th Edition
ISBN:9781285853918
Author:H. Stephen Stoker
Publisher:H. Stephen Stoker
Chapter10: Acids, Bases, And Salts
Section: Chapter Questions
Problem 10.42EP: Write the acid ionization constant expression for the ionization of each of the following monoprotic...
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Citric acid, which is present in citrus fruits, is a triprotic acid
. (a) Calculate the pH of a 0.040 M solution of
citric acid. (b) Did you have to make any approximations
or assumptions in completing your calculations? (c) Is the
concentration of citrate ion (C6H5O73-) equal to, less than,
or greater than the H+ ion concentration?

TABLE 16.3 Acid-Dissociation Constants of Some Common
Polyprotic Acids
Name
Formula
K1
K2
Ascorbic
H2CH¿O6
8.0 x 10-5
1.6 x 10-12
Carbonic
Н.СО,
4.3 x 10-7
5.6 x 10-1"
Citric
H;C,H5O7
7.4 x 104
1.7 x 10-5
4.0 x 107
Охalic
HOOC-COOH
5.9 x 10-2
6.4 x 10-5
Phosphoric
Н,РО,
7.5 x 10-3
6.2 x 10-8
4.2 x 10-13
Sulfurous
H,SO,
1.7 x 10 2
6.4 x 108
Sulfuric
H2SO4
Large
1.2 x 10-2
Tartaric
С-Н.О,(СООН)2
1.0 x 10-
4.6 x 10-5
Transcribed Image Text:TABLE 16.3 Acid-Dissociation Constants of Some Common Polyprotic Acids Name Formula K1 K2 Ascorbic H2CH¿O6 8.0 x 10-5 1.6 x 10-12 Carbonic Н.СО, 4.3 x 10-7 5.6 x 10-1" Citric H;C,H5O7 7.4 x 104 1.7 x 10-5 4.0 x 107 Охalic HOOC-COOH 5.9 x 10-2 6.4 x 10-5 Phosphoric Н,РО, 7.5 x 10-3 6.2 x 10-8 4.2 x 10-13 Sulfurous H,SO, 1.7 x 10 2 6.4 x 108 Sulfuric H2SO4 Large 1.2 x 10-2 Tartaric С-Н.О,(СООН)2 1.0 x 10- 4.6 x 10-5
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