Question

From the information in Table 5E.1, select suitable buffers for (a) pH = 3.2 and (b) pH = 10.0. (Textbook Exercises 5F.4 modified)

Answer 1

From the information in Table 5E.1, select suitable buffers for (a) pH- 3.2 and (b) pH- 10.0. (Textbook Exercises 5F.4 modified) for a pH 3.2 tartaric acid and sodium hydrogen tartarate buffer for any buffer pH-pKa +1 or pH-pKa-1 this region suitable for mentioned Table 5E.1 Successive acidity constants of polyprotic acids at 298.15 k buffer Acid K,i 4.3 x 107 6.37 5.6 x 10- 0.25 13 x 10 688 71x 10 14.15 Carbonic acid, H2CO Hydrosulfuric acid, H,S Ethanedioic acid (oxalic acid), (CO0H2 Phosphoric acid, H,PO Phosphorous acid, H,PO Sulfuric acid, H,SO, Sulfurous acid, H,SO Veffaric acid, CH,o,(COOH), for pH 10.0 5.9x 10 1.23 6.5x 10 4.19 НСОЗА, and CO3^-2 is suitable buffer 76 x 103 2.12 6.2 x 108 10 x 102 2.00 26x 107 6.59 Strong 15 x 102181 12 x 1076.91 6.0x 10 3.22 15x 10 4.82 721 2.1 x 10131267 as pKa2 10.25 suitable buffer 12 x 10 1.92