Question

What is the hydronium ion concentration in a solution prepared by mixing 150.00 mL of 0.10 M HCN with 150.00 mL of 0.030 M NaCN? Assume that the volumes of the solutions are additive and that Ka = 4.9x10^-10. a) 1.6 x 10^-9 M b) 2.4 x 10^10 M c) 7.0 x 10^-6 M d) 4.9 x 10^-10 M