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A student scientist prepares a citrate buffer solution and for this weighs 3.19 grams of Na2C6H6O7 and calibrates to 250 mL (flask A) and weighs

A student scientist prepares a citrate buffer solution and for this weighs 3.19 grams of Na2C6H6O7 and calibrates to 250 mL (flask A) and weighs 2.45 grams of NaC6H7O7 and calibrates in another flask (B) to 250 mL. Subsequently, the student measures 132 mL of A and makes up to 250 mL with B. 

a)What is the pH of said solution?

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