What Is the Hydronium Ion Concentration in a Solution Prepared

question 186

Multiple Choice

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 K_a = 4.9 × 10^-10 for HCN.

• A)4.9 × 10^-11 M
• B)4.9 × 10^-10 M
• C)4.9 × 10^-9 M
• D)7.0 × 10^-6 M

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