The pH range for benzoic acid - benzoate buffer is 4.64. [H₃O⁺] for benzoic acid - benzoate buffer is 4.70x10⁻³
What is benzoic acid - benzoate buffer?
Although both benzoic and propanoic acids could be employed, benzoic acid and the salt sodium benzoate will provide the most effective buffer solution since its pKa (4.20) is closest to the pH of 4.5. This indicates that the sodium salt's concentration must be two times that of the benzoic acid. It has a 0.5 mole buffer capacity for both acid and base. On the other hand, if one began with a solution that contained 0.1 moles of benzoic acid and neutralized it with 0.05 moles of OH-, the resulting buffer would include 0.05 moles of benzoic acid and the benzoate ion.
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