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You have a 0.200 L of solution containing 100 mM phosphate buffer, pH 6.8. What would...

You have a 0.200 L of solution containing 100 mM phosphate buffer, pH 6.8. What would the pH of the above solution be after you add the following, with respect to the TOTAL amount of phosphate in the buffer... (a) 1/4 equivalence of NaOH, (b) 1/2 equivalence of NaOH, (c) 1/4 equivalence of HCl, and (d) 1/2 equivalence of HCl

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