EOC Problem 7.100 Select weak acid or weak acids from the table below, which wit

Question

EOC Problem 7.100 Select weak acid or weak acids from the table below, which with its conjugate base, could buffer at the following pH values? Name Hydrochloric acid Phosphoric acid Hydrofluoric acid Lactic acid Acetic acid Carbonic acid Dihydrogen phosphate ionH,PO, Ammonium ion Hydrocyanic acid Hydrogen carbonate ion Methylammonium ion Hydrogen phosphate ion Formula HCl H3Po HF CH3CH(OH)CO2H CH3CO2H H2CO K, 1.0 × 107 7.5× 10-3 6.6× 10-4 1.4× 10 1.8 × 10-5 4.4 x 10-7 6.2 x 10-8 5.6 x 10-10 4.9 × 10-10 5.6× 10-11 2.4 × 10-11 4.2 × 10 pKa 2.12 3.18 3.85 4.74 6.36 7.21 9.25 9.31 10.25 10.62 12.38 NH4 HCN HCO3 CH,NH, HPO2-

Explanation / Answer

For a buffer pH = 10

use pKa vlaues nearest to 10

those will be approx:

- Ammonium ion, NH4+; 9.25

- Hydrocyanic acid, 9.31

- HCO3- ions, with 10.25

- CH3NH3+ ions, with approx 10.62

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