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Arsenic acid is a triprotic acid with the pKa values pK₁1 = 2.240, pKa2 = 6.960, and pK₁3 = 11.500. You wish to prepare 1.000 L of a 0.0200 M arsenate buffer at pH 6.840. To do this, you choose to mix the two salt forms involved in the second ionization, NaH₂ AsO4 and Na₂HASO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? 2.43 mass NaH₂ AsO4 = g mass Na₂HASO4 = g Incorrect 0.9574 Incorrect

Arsenic acid is a triprotic acid with the pKa values pK₁1 = 2.240, pKa2 = 6.960, and pK₁3 = 11.500. You wish to prepare 1.000 L of a 0.0200 M arsenate buffer at pH 6.840. To do this, you choose to mix the two salt forms involved in the second ionization, NaH₂ AsO4 and Na₂HASO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? 2.43 mass NaH₂ AsO4 = g mass Na₂HASO4 = g Incorrect 0.9574 Incorrect

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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Arsenic acid is a triprotic acid with the pKą values pKa1 = 2.240, pK₂2 = 6.960, and pKa3 = 11.500. You wish to prepare 1.000 L of a 0.0200 M arsenate buffer at pH 6.840. To do this, you choose to mix the two salt forms involved in the second ionization, NaH₂AsO and Na₂HASO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? 4 2.43 mass NaH₂ AsO4 mass Na₂ HASO4 = = Incorrect 0.9574 Incorrect 6.0 g 6.0 g
Transcribed Image Text:Arsenic acid is a triprotic acid with the pKą values pKa1 = 2.240, pK₂2 = 6.960, and pKa3 = 11.500. You wish to prepare 1.000 L of a 0.0200 M arsenate buffer at pH 6.840. To do this, you choose to mix the two salt forms involved in the second ionization, NaH₂AsO and Na₂HASO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture? 4 2.43 mass NaH₂ AsO4 mass Na₂ HASO4 = = Incorrect 0.9574 Incorrect 6.0 g 6.0 g
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