Answered: You want to make a 500.0 mL of 0.0500 M…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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You want to make a 500.0 mL of 0.0500 M of phosphate buffer pH = 6.80 from solid Na₂HPO₄ compound and a 0.300 M of NaH₂PO₄ solution on the shelf. Calculate the mass of solid Na₂HPO₄ compound required and calculate the volume of the 0.300 M of NaH₂PO₄solution required to make the buffer, then explain briefly how you would make the buffer. You will need the Molar Mass of Na₂HPO₄.

K_a of NaH₂PO₄ = 6.2 x 10^-8.

Note: the [Na₂HPO₄] + [NaH₂PO₄] = 0.0500 M.

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