Which of the Following Solutions Will Be the Best Buffer

question 164

Multiple Choice

Which of the following solutions will be the best buffer at a pH of 9.26? (K_a for HC₂H₃O₂ is 1.8 × 10^-5; K_b for NH₃ is 1.8 × 10^-5.)

• A) 0.20M NH₃ and 0.20M NH₄Cl
• B) 5.0M HC₂H₃O₂ and 5.0M NH₄Cl
• C) 0.20M HC₂H₃O₂ and 0.20M NaC₂H₃O₂
• D) 5.0M NH₃ and 5.0M NH₄Cl
• E) 5.0M HC₂H₃O₂ and 5.0M NH₃

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