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) + Ind?-(aq) 1/KMgind Mg2*(aq) + EDTA?-(aq) Mg-EDTA (aq) KMp EDTA where KcaEDTA. Kuoind and KM EDTA 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-
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) + Ind?-(aq) 1/KMgind Mg2*(aq) + EDTA?-(aq) Mg-EDTA (aq) KMp EDTA where KcaEDTA. Kuoind and KM EDTA 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-
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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Based on the
a. [Mg2+] [Ind2-]
b. [Mg-Ind] / {[Mg2+] [Ind2-]}
c. {[Mg2+] [Ind2-]} / [Mg-Ind]
d. {[Mg-EDTA][Ind2-]} / {Mg-Ind] [EDTA2-]}
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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