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You prepare a buffer solution by dissolving 2.00 g each of benzoic acid, C6H5COOH and sodium benzoate, NaC6H5COO in 750.0 mL of water. What is the pH of this buffer? Assume that the solution's volume is 750.0 mL.

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Dron
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  1. mols = grams/molar mass
    and M = mols/L

    Convert 2.00 g each into mols with the above formula, then use the second one to find M.
    Plug these into the Henderson-Hasselbalch equation and solve for pH. Post your work if you get stuck.

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    DrBob222

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