(Answered) A what is the ph of a buffer prepared by adding 0708 mol

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A) What is the PH of a buffer prepared by adding 0.708 mol of weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66*10^-7?

B) What is the PH after 0.150 mol of HCl is added to the buffer in part A? Assume no volume change on the addition of acid?

c) What is the PH after 0.195mol of NaOH is added to the buffer in part A? Assume no volume change

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