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3. Show calculation of the calculated pH of your phosphate buffer (part D). Be sure to include units, and to report the correPART D: INVESTIGATING PHOSPHATE BUFFERS Units Value Desired pH unitless 2 to 3 Acid chosen H3PO4 kg of chosen acid 7.5 x 10-3

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Answer #1

pH = pKa + log(base / acid)

here the concentration of base and acid is equal so equation become

pH = pKa + log(1)

pH = pKa

now given

Ka = 7.5 x 10-3

pKa = -log Ka

pKa = -log (7.5 x 10-3)

pKa = 2.12

pH = 2.12

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