Calculate the pH of a buffer solution that contains 0.10 M acetic acid (Table 2.6) and 0.25 M sodium acetate.

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Table 2.6 Acid Pyruvic acid Formic acid Lactic acid Benzoic acid Acetic acid Dissociation Constants of Some Acids Ammonium ion Oxalic acid (1) Oxalic acid (2) Malonic acid (1) Malonic acid (2) Malic acid (1) Malic acid (2) Succinic acid (1) Succinic acid (2) Carbonic acid (1) Carbonic acid (2) Citric acid (1) Citric acid (2) Citric acid (3) Phosphoric acid (1) Phosphoric acid (2) Phosphoric acid (3) HA CH₂COCOOH HCOOH CH₂CHOHCOOH CH₂COOH CH₂COOH NH HOOC–COOH HOOC—COO- HỌOC–CH,COOH HOOC–CH_–C00- HOOC–CH,CHOH—COOH HOOC–CH,–CHOH–COO- HOOC–CH–CH_–COOH HOOC–CH,CH,–COO- H,CO, HCO HOOC–CH,–C(OH) (COOH)-CH₂-COOH HOOC–CH,–C(OH) (COOH) -CH₂-COO™ OOC-CH₂-C(OH) (COOH) -CH₂-COO™ H₂PO4 H₂PO HPO A™ CH₂C-COO HCOO- CH,CH—HCOO- C, H,COO CH₂COO™ NH3 HỌỌC—COO -OOC-COO- HOOC–CH,–C0O- -OOC-CH₂-COO- HOOC–CH–CHOH–COO OOC-CH₂-CHOH-COO HOOC–CH_CH,COO -OOC-CH₂-CH₂-COO- HCO, CO²- HOOC–CH–C(OH) (COOH) -CH₂-COO™ OOC-CH₂-C(OH) (COOH)-CH₂-COO™ OOC-CH₂-C(OH) (COO)— CH₂-COO™ H₂PO4 HPO PO K₂ 3.16 x 10-3 1.78 x 10-4 1.38 x 10-4 6.46 x 10-5 1.76 x 10-5 5.6 x 10-10 5.9 x 10-² 6.4 x 10-5 1.49 × 10-³ 2.03 × 102-6 3.98 x 10-4 5.5 x 10-6 6.17 x 10-5 2.3 x 10-6 4.3 x 10-7 5.6 x 10-11 8.14 x 10-1 1.78 x 10-5 3.9 x 10-6 7.25 x 10-3 6.31 x 10-8 3.98 x 10-15 pka 2.50 3.75 3.86 4.19 4.76 9.25 1.23 4.19 2.83 5.69 3.40 5.26 4.21 5.63 6.37 10.20 3.09 4.75 5.41 2.14 7.20 12.40