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Which of the following combinations of buffering systems and molar ratios of compounds would work best for a laboratory experiment requiring a pH of 2.4? (pKa (H3PO4) = 2.12 and pKa (HF) = 3.15). (a) 0.57 mol H3PO4 / 0.30 mol H₂PO4 (b) 0.60 mol HF / 0.11 mol F- (c) 0.11 mol HF / 0.60 mol F- (d) 0.30 mol H3PO4 / 0.57 mol H₂PO4 (e) none of the above

Which of the following combinations of buffering systems and molar ratios of compounds would work best for a laboratory experiment requiring a pH of 2.4? (pKa (H3PO4) = 2.12 and pKa (HF) = 3.15). (a) 0.57 mol H3PO4 / 0.30 mol H₂PO4 (b) 0.60 mol HF / 0.11 mol F- (c) 0.11 mol HF / 0.60 mol F- (d) 0.30 mol H3PO4 / 0.57 mol H₂PO4 (e) none of the above

Chemistry
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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**Question:** Which of the following combinations of buffering systems and molar ratios of compounds would work best for a laboratory experiment requiring a pH of 2.4? (pKa (H₃PO₄) = 2.12 and pKa (HF) = 3.15). **Options:** (a) 0.57 mol H₃PO₄ / 0.30 mol H₂PO₄⁻ (b) 0.60 mol HF / 0.11 mol F⁻ (c) 0.11 mol HF / 0.60 mol F⁻ (d) 0.30 mol H₃PO₄ / 0.57 mol H₂PO₄⁻ (e) none of the above
Transcribed Image Text:**Question:** Which of the following combinations of buffering systems and molar ratios of compounds would work best for a laboratory experiment requiring a pH of 2.4? (pKa (H₃PO₄) = 2.12 and pKa (HF) = 3.15). **Options:** (a) 0.57 mol H₃PO₄ / 0.30 mol H₂PO₄⁻ (b) 0.60 mol HF / 0.11 mol F⁻ (c) 0.11 mol HF / 0.60 mol F⁻ (d) 0.30 mol H₃PO₄ / 0.57 mol H₂PO₄⁻ (e) none of the above
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