What Is the Hydronium Ion Concentration in a Solution Prepared

question 26

Multiple Choice

What is the hydronium ion concentration in a solution prepared by mixing 150.0 mL of 0.10 M HCN with 150.0 mL of 0.050 M NaCN? Assume that the volumes of the solutions are additive and that K_a = 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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