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How many mL of 0.350M HClO4 must be added to 600.0 mL of 0.450M lithium cyanide...

How many mL of 0.350M HClO4 must be added to 600.0 mL of 0.450M lithium cyanide (LiCN) to produce a pH = 9.50 buffer? The Ka hydrocyanic acid (HCN) is 6.2 × 10–10

A. 91.5 mL

B. 138 mL

C. 262 mL

D. 396 mL

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