What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that Ka = 4.9 × 10-10 for HCN.
A) 2.4 × 10-10 M
B) 4.9 × 10-10 M
C) 9.8 × 10-10 M
D) 7.0 × 10-6 M
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