Formic acid, HCHO₂, is used to make methyl formate (a fumigant for dried fruit) and ethyl formate (an artificial rum flavor). What is the pH of a 0.12 M solution of formic acid? What is the degree of ionization of HCHO₂ in this solution? See Table 16.1 for K_a.

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Table 16.1 Acid-lonization Constants at 25°C* Substance Formula K, Acetic acid HC,H,O, 1.7 x 10-5 Benzoic acid HC,H,O, 6.3 x 10-5 Boric acid H,BO, 5.9 x 10-10 Carbonic acid H,CO, 4.3 x 10-7 HCO,- 4.8 x 10-11 Cyanic acid HOCN 3.5 x 10-4 Formic acid HCHO, 1.7 x 10-4 Hydrocyanic acid HCN 4.9 x 10-10 Hydrofluoric acid HF 6.8 x 10-4 Hydrogen sulfate ion HSO,- 1.1 x 10-2 Hydrogen sulfide H,S 8.9 x 10- 1.2 x 10-13 HS- Hypochlorous acid HCIO 3.5 x 10-8 Nitrous acid HNO, 4.5 x 10-4 Oxalic acid H,C,O, 5.6 x 10-2 HC,0,- 5.1 x 10-5 Phosphoric acid H,PO, 6.9 x 10-3 H,PO,- 6.2 x 10-8 HPO,- 4.8 x 10-1 Phosphorous acid H,PHO, 1.6 x 10-2 НРНО,- 7x 10-7 Propionic acid HC,H,O, 1.3 x 10-5 Рyruvic acid HC,H,O, 1.4 x 10-4 Sulfurous acid H,SO, 1.3 x 10-2 HSO, 6.3 x 10-