1. How much NaH2PO4 and Na2HPO4 in grams are needed to prepare 3.00L of 25.0 mM phosphate buffer pH 6.5 (pKa for H2PO4 is 7.21) Molar Mass: NaH2PO4 = 119.976 g/mol Na2HPO4 = 141.958 g/mol
1. How much NaH2PO4 and Na2HPO4 in grams are needed to prepare 3.00L of 25.0 mM phosphate buffer pH 6.5 (pKa for H2PO4 is 7.21) Molar Mass: NaH2PO4 = 119.976 g/mol Na2HPO4 = 141.958 g/mol
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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![1. How much NaH2PO4 and Na2HPO4 in grams are needed to prepare 3.00L of 25.0 mM
phosphate buffer pH 6.5 (pka for H2PO4 is 7.21)
Molar Mass:
NaH2PO4 = 119.976 g/mol
Na2HPO4 = 141.958 g/mol
2. What volumes of 50 mM CH3COOH and 30 mM NaCH3CO0 solutions are needed to
prepare 2L of 20 mM acetate buffer pH 3.6?
(pKa for acetic acid is 4.74)
3. Calculate the pH of a buffer solution that is 0.5 M CH3COOH and 0.8 M NACH3COO.
(pKa for acetic acid is 4.74)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0a9285f1-f634-49e1-8f1d-8c70adb95172%2F6455f7d9-cdac-48f5-a07b-2c3e38212e6d%2Fb8gyj9_processed.png&w=3840&q=75)
Transcribed Image Text:1. How much NaH2PO4 and Na2HPO4 in grams are needed to prepare 3.00L of 25.0 mM
phosphate buffer pH 6.5 (pka for H2PO4 is 7.21)
Molar Mass:
NaH2PO4 = 119.976 g/mol
Na2HPO4 = 141.958 g/mol
2. What volumes of 50 mM CH3COOH and 30 mM NaCH3CO0 solutions are needed to
prepare 2L of 20 mM acetate buffer pH 3.6?
(pKa for acetic acid is 4.74)
3. Calculate the pH of a buffer solution that is 0.5 M CH3COOH and 0.8 M NACH3COO.
(pKa for acetic acid is 4.74)
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