ТАBLE 2.6 Dissociation Constants of Some Acids Acid НА A K, pK, Руruvic acid CH,COCOOH CH,C-COO 3.16 X 10-3 2.50 Formic acid НСООН HCOO 1.78 х 10-4 3.75 CH,CH–HCO0- GH;COO Lactic acid CH,CHOHCOOH 1.38 х 10-4 3.86 6.46 х 10-5 1.76 х 10-5 Веnzoic acid CH;COOH 4.19 Аcetic acid CH,COOH CH,COO 4.76 NH 5.6 х 10-10 9.25 Ammonium ion NH, Охalic acid (1) НООС—СООН НООС—СОО 5.9 х 10-2 1.23 Охalie acid (2) 6.4 х 10-3 HOOC-COO ООС—СОо 4.19 Malonic acid (1) НООС—СH,——СООН HOOC-CH,COO 1.49 х 10-3 2.83 Malonic acid (2) HOOC-CH COO НООС—СH —СНОН—СООН "OOC-CH CO 2.03 х 102-в 5.69 3.98 х 10- 5.5 х 10-6 Malic acid (1) НООС—СH,—СНОН—СОо 3.40 Malic acid (2) НООС—СH—СНОН—СОО- HOOC-CH CH,O-OOH HOOC–CH-CH,–COO OOC-CH-CHOH-CO0 5.26 Succinic acid (1) HOOC-CH-CH-COO 6.17 х 10-5 4.21 Succinic acid (2) O0C-CH-CH COO 2.3 х 10 6 5.63 Carbonic acid (1) H,CO, HCO, 4.3 x 10-7 6.37 Carbonic acid (2) HCO, Co 5.6 х 10-11 10.20 8.14 x 10 1.78 х 10-5 Citric acid (1) HOOC-CHC(OH) HOOC–CH,-C(OH) 3.09 (СООН)—СН, —соон (СООН) — СН —со- 4.75 Citric acid (2) HOOC-CH-C(OH) (COOH) OOC-CHC(OH) -CH-COO (COOH)-CH,-COO Citric acid (3) 3.9х 10-6 -00C-CH,-C(OH) (COOH) -CH-COO- -O0c-CH-C(OH) (COO")- CH-COO 5.41 Phosphoric acid (1) Phosphoric acid (2) Phosphoric acid (3) H,PO, H,PO, 7.25 х 10-3 2.14 НРО PO H,PO, 6.31 x 10- 7.20 НРО 3.98 х 10-13 12.40

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Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid (see Table 2.6) and 25 mL of 1.0 M sodium lactate.

ТАBLE 2.6
Dissociation Constants of Some Acids
Acid
НА
A
K,
pK,
Руruvic acid
CH,COCOOH
CH,C-COO
3.16 X 10-3
2.50
Formic acid
НСООН
HCOO
1.78 х 10-4
3.75
CH,CH–HCO0-
GH;COO
Lactic acid
CH,CHOHCOOH
1.38 х 10-4
3.86
6.46 х 10-5
1.76 х 10-5
Веnzoic acid
CH;COOH
4.19
Аcetic acid
CH,COOH
CH,COO
4.76
NH
5.6 х 10-10
9.25
Ammonium ion
NH,
Охalic acid (1)
НООС—СООН
НООС—СОО
5.9 х 10-2
1.23
Охalie acid (2)
6.4 х 10-3
HOOC-COO
ООС—СОо
4.19
Malonic acid (1)
НООС—СH,——СООН
HOOC-CH,COO
1.49 х 10-3
2.83
Malonic acid (2)
HOOC-CH COO
НООС—СH —СНОН—СООН
"OOC-CH CO
2.03 х 102-в
5.69
3.98 х 10-
5.5 х 10-6
Malic acid (1)
НООС—СH,—СНОН—СОо
3.40
Malic acid (2)
НООС—СH—СНОН—СОО-
HOOC-CH CH,O-OOH
HOOC–CH-CH,–COO
OOC-CH-CHOH-CO0
5.26
Succinic acid (1)
HOOC-CH-CH-COO
6.17 х 10-5
4.21
Succinic acid (2)
O0C-CH-CH COO
2.3 х 10 6
5.63
Carbonic acid (1)
H,CO,
HCO,
4.3 x 10-7
6.37
Carbonic acid (2)
HCO,
Co
5.6 х 10-11
10.20
8.14 x 10
1.78 х 10-5
Citric acid (1)
HOOC-CHC(OH)
HOOC–CH,-C(OH)
3.09
(СООН)—СН, —соон
(СООН) — СН —со-
4.75
Citric acid (2)
HOOC-CH-C(OH) (COOH)
OOC-CHC(OH)
-CH-COO
(COOH)-CH,-COO
Citric acid (3)
3.9х 10-6
-00C-CH,-C(OH) (COOH)
-CH-COO-
-O0c-CH-C(OH) (COO")-
CH-COO
5.41
Phosphoric acid (1)
Phosphoric acid (2)
Phosphoric acid (3)
H,PO,
H,PO,
7.25 х 10-3
2.14
НРО
PO
H,PO,
6.31 x 10-
7.20
НРО
3.98 х 10-13
12.40
Transcribed Image Text:ТАBLE 2.6 Dissociation Constants of Some Acids Acid НА A K, pK, Руruvic acid CH,COCOOH CH,C-COO 3.16 X 10-3 2.50 Formic acid НСООН HCOO 1.78 х 10-4 3.75 CH,CH–HCO0- GH;COO Lactic acid CH,CHOHCOOH 1.38 х 10-4 3.86 6.46 х 10-5 1.76 х 10-5 Веnzoic acid CH;COOH 4.19 Аcetic acid CH,COOH CH,COO 4.76 NH 5.6 х 10-10 9.25 Ammonium ion NH, Охalic acid (1) НООС—СООН НООС—СОО 5.9 х 10-2 1.23 Охalie acid (2) 6.4 х 10-3 HOOC-COO ООС—СОо 4.19 Malonic acid (1) НООС—СH,——СООН HOOC-CH,COO 1.49 х 10-3 2.83 Malonic acid (2) HOOC-CH COO НООС—СH —СНОН—СООН "OOC-CH CO 2.03 х 102-в 5.69 3.98 х 10- 5.5 х 10-6 Malic acid (1) НООС—СH,—СНОН—СОо 3.40 Malic acid (2) НООС—СH—СНОН—СОО- HOOC-CH CH,O-OOH HOOC–CH-CH,–COO OOC-CH-CHOH-CO0 5.26 Succinic acid (1) HOOC-CH-CH-COO 6.17 х 10-5 4.21 Succinic acid (2) O0C-CH-CH COO 2.3 х 10 6 5.63 Carbonic acid (1) H,CO, HCO, 4.3 x 10-7 6.37 Carbonic acid (2) HCO, Co 5.6 х 10-11 10.20 8.14 x 10 1.78 х 10-5 Citric acid (1) HOOC-CHC(OH) HOOC–CH,-C(OH) 3.09 (СООН)—СН, —соон (СООН) — СН —со- 4.75 Citric acid (2) HOOC-CH-C(OH) (COOH) OOC-CHC(OH) -CH-COO (COOH)-CH,-COO Citric acid (3) 3.9х 10-6 -00C-CH,-C(OH) (COOH) -CH-COO- -O0c-CH-C(OH) (COO")- CH-COO 5.41 Phosphoric acid (1) Phosphoric acid (2) Phosphoric acid (3) H,PO, H,PO, 7.25 х 10-3 2.14 НРО PO H,PO, 6.31 x 10- 7.20 НРО 3.98 х 10-13 12.40
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