Answered: phosphate buffer at pH 7.5. You are out…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter14: Equilibria In Acid-base Solutions

Section: Chapter Questions

Problem 37QAP: Given three acid-base indicatorsâ€”methyl orange (end point at pH 4), bromthymol blue (end point at...

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You are in charge of making a phosphate buffer at pH 7.5. You are out of solid versions of phosphate,
but you find stock solutions of 1.0 M NaH2PO4 and 1.0 M Na2HPO4 in the lab and decide to make the
buffer with these solutions. How much of each of the stock solutions would you mix together to make 200
mL of 1.0 M phosphate buffer at pH 7.5? (The pKa values of phosphoric acid are 2.1, 7.2, and 12.3.)

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