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Which of the following is equivalent to the overall concentration of Mg-EDTA near the endpoint? a. [Mg2+] [EDTA2-] b. [Mg-EDTA] / {[Mg2+] [EDTA2-]} c. {[Mg2+] [EDTA2-]} / [Mg-EDTA] d. {[Mg-EDTA][Ind2-]} / {[Mg-Ind] [EDTA2-]}

Which of the following is equivalent to the overall concentration of Mg-EDTA near the endpoint? a. [Mg2+] [EDTA2-] b. [Mg-EDTA] / {[Mg2+] [EDTA2-]} c. {[Mg2+] [EDTA2-]} / [Mg-EDTA] d. {[Mg-EDTA][Ind2-]} / {[Mg-Ind] [EDTA2-]}

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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Which of the following is equivalent to the overall concentration of Mg-EDTA near the endpoint?

a. [Mg2+] [EDTA2-]

b. [Mg-EDTA] / {[Mg2+] [EDTA2-]}

c. {[Mg2+] [EDTA2-]} / [Mg-EDTA]

d. {[Mg-EDTA][Ind2-]} / {[Mg-Ind] [EDTA2-]}

In the analysis for total hardness, formation of Ca-EDTA complex in the presence of an magnesium-calmagite indicator (or Mg-Ind) complex involves the ff. reactions: Ca*(aq) + EDTA?-(aq) = Ca-EDTA (aq) KcaEDTA Mg-Ind (aq) = Mg²"(aq) + Ind2-(aq) 1/KMgind Mg2 (aq) + EDTA?-(aq) = Mg-EDTA (aq) KMPEDTA where KcaEDTA. KMoind and KMEDTA are the equilibrium constants for the complex formation. The over-all concentration of the Mg-EDTA complex near the endpoint is equal to KMp-EDTA /Kng-Ind-
Transcribed Image Text:In the analysis for total hardness, formation of Ca-EDTA complex in the presence of an magnesium-calmagite indicator (or Mg-Ind) complex involves the ff. reactions: Ca*(aq) + EDTA?-(aq) = Ca-EDTA (aq) KcaEDTA Mg-Ind (aq) = Mg²"(aq) + Ind2-(aq) 1/KMgind Mg2 (aq) + EDTA?-(aq) = Mg-EDTA (aq) KMPEDTA where KcaEDTA. KMoind and KMEDTA are the equilibrium constants for the complex formation. The over-all concentration of the Mg-EDTA complex near the endpoint is equal to KMp-EDTA /Kng-Ind-
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