What Combination of Substances Will Give a Buffered Solution That

question 161

Multiple Choice

What combination of substances will give a buffered solution that has a pH of 5.05? Assume each pair of substances is dissolved in 5.0 L of water. (K_b for NH₃ = 1.8 × 10^-5; K_b for C₅H₅N = 1.7 × 10^-9)

• A) 1.0 mol C₅H₅N and 1.5 mol C₅H₅NHCl
• B) 1.0 mol NH₃ and 1.5 mol NH₄Cl
• C) 1.5 mol NH₃ and 1.0 mol NH₄Cl
• D) 1.5 mol C₅H₅N and 1.0 mol C₅H₅NHCl
• E) none of these

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