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| 1. |
What ratio of NaCN to HCN is needed to prepare a pH 9.40 buffer? (Ka of HCN is 4.9 × 10⁻¹⁰) |
| Answer» HCN (aq) + H2O (aq) ⇄ CN– (aq) + H3O+ (aq ); Ka = 4.9 x 10–10. 2 H2O (l) ... What percentage of a weak acid ORIGINALLY present ... PREPARE a buffer SOLUTION with pH = 4.10 with ... | |