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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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