What Ratio of [NH₄⁺]/[NH₃] Would Provide a Buffer of PH

question 58

Multiple Choice

What ratio of [NH₄⁺]/[NH₃] would provide a buffer of pH low enough to avoid precipitation of Co(OH) ₂ [Ksp = 2.0 × 10^-14] from a 0.50 M Co²⁺ solution? [Kb for NH₃ = 1.8 × 10^-5]

• A) 1/50
• B) 1/90
• C) 1/1
• D) 90/1
• E) 50/1

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