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.

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Table 2.6 Acid Pyruvic acid Formic acid Lactic acid Benzoic acid Acetic acid 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) Dissociation Constants of Some Acids Citric acid (3) Phosphoric acid (1) Phosphoric acid (2) Phosphoric acid (3) HA CH₂COCOOH HCOOH CH₂CHOHCOOH CH₂COOH CH₂COOH NH HỌOC–COOH HỌOC—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 H₂PO4 HPO A CH₂C-COO HCOO- CH,CH—HCOO- C,H,COO CH₂COO™ NH3 HỌỌC—COO- -OOC-COO- HOOC–CH,–C00- -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 10-1 1.38 x 10-1 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- 6.31 x 10-8 3.98 x 10-13 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