What is the ph of the solution before adding naoh what is, Chemistry

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What is the ph of the solution before adding naoh what is

You dissolve 0.425 g of NaOH in 3.00 L of a buffer solution that has [H2PO4? ] = [HPO42- ] = 0.132 M.

(a) What is the pH of the solution before adding NaOH?

(b) What is the pH of the solution after adding NaOH?

A buffer solution is composed of 1.337 g of KH2PO4 and 5.666 g of Na2HPO4.
(a) What is the pH of the buffer solution?

(b) What mass of KH2PO4 must be added to decrease the buffer solution pH by 0.5 unit from the value calculated in part (a)?

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