What Is the Approximate Concentration of Free Ni²⁺ Remaining at Equilibrium

question 85

Multiple Choice

What is the approximate concentration of free Ni²⁺ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl₂ with 5.0 mL of 2.0 M NH₃(aq) ? [The net formation constant for the hexamminenickel(II) ion is 5.5 × 10⁸.]

• A) 1.8 × 10^-9 M
• B) 7.7 × 10^-10 M
• C) 1.3 × 10^-10 M
• D) 2.4 × 10^-10 M
• E) 0.050 M

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