What Combination of Substances Will Give a Buffered Solution That $\times$

question 78

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 $\times$ 10^-5;K_b for C₅H₅N = 1.7 $\times$ 10^-9)

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

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