The pH of an aqueous solution containing 1 M benzoic acid () and 1 M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mL of this buffer solution is mL.

Question

The pH of an aqueous solution containing 1 M benzoic acid () and 1 M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mL of this buffer solution is  mL.

Canvas Classes · Accepted Answer

Step 1 — Henderson-Hasselbalch equation:

Step 2 — Find volumes:
Both solutions are 1 M. Let volume of acid =  mL, volume of salt =  mL.

Since both are 1 M, moles ratio = volume ratio:

Answer: 100 mL

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