Problem: Consider a buffer composed of the weak acid HA and its conjugate base A–. Which pair of concentrations results in the most effective buffer?a) 0.10 M HA; 0.10 M A–b) 0.50 M HA; 0.50 M A–c) 0.90 M HA; 0.10 M A–d) 0.10 M HA; 0.90 M A–

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Consider a buffer composed of the weak acid HA and its conjugate base A. Which pair of concentrations results in the most effective buffer?
a) 0.10 M HA; 0.10 M A
b) 0.50 M HA; 0.50 M A
c) 0.90 M HA; 0.10 M A
d) 0.10 M HA; 0.90 M A

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