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The pKa value for HCN is 9.40. Would a buffer prepared from HCN and NaCN with a pH of 8.90 be considered to be an effective buffer? A buffer in which the mole ratio of NaCN to HCN is 0.41 ha as a pH of 9.01. Would this buffer solution have a greater capacity for added acid (H3O^+) or added base (OH^-)?