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buffer solution

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ahmedm3ntawi:
A buffer solution is prepared by mixing 75.0 mL of 0.275 M fluorobenzoic acid (C7H5O2F) with 55.0 mL of 0.472 M sodium fluorobenzoate. The pKa ​of this weak acid is 2.90. What is the pH of the resulting buffer solution?

really need this answered its urgent.

chenbeier:
No answer without your work. Do you know the Henderson Hasselbalch equation?

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