What Is the Approximate Concentration of Free Ni²⁺(aq)remaining at Equilibrium

question 20

Multiple Choice

What is the approximate concentration of free Ni²⁺(aq) remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl(aq) ₂ 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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