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A buffer solution is prepared by dissolving 1.50g each of benzioc acid C6H5CO2H and sodium benzoate NaC6H5CO2 in 150.0mL of solution.
a) What is the pH of this buffer solution?
b) Which buffer component must be added and what quantity is needed to change the pH to 4.00?
c) What quantity of 2.0M NaOH or 2.0M HCl must be added to the buffer to change the pH to 4.00?

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