What Is the Minimum Concentration of CN^-(aq)that Will Prevent the Precipitation

question 31

Multiple Choice

What is the minimum concentration of CN^-(aq) that will prevent the precipitation of AgX(s) from a solution that is 0.149 M in X^-(aq) and 0.0184 M in Ag⁺(aq) ?
(K_sp for AgX(s) = 5.2 × 10^-17;K_f for Ag(CN) ₂^- = 5.6 × 10¹⁸)

• A)3.1 × 10^-3 M
• B)9.4 × 10^-6 M
• C)1.8 × 10^-10 M
• D)1.2 × 10^-3 M
• E)9.6 × 10^-3 M

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