A 500-ML Sample of 2

question 39

Multiple Choice

A 50.0-mL sample of 2.0  10^-4 M CuNO₃ is added to 50.0 mL of 4.0 M NaCN. Cu⁺ reacts with CN^- to form the complex ion Cu(CN) ₃^2-: What is the concentration of CN^- at equilibrium?

• A) 6.0  10^-4 M
• B) 1.0 M
• C) 4.0 M
• D) 2.0 M
• E) none of these

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