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: Ca2*(aq) + EDTA²-(aq) = Ca-EDTA (aq) Kca-EDTA Mg-Ind (aq) = Mg2*(aq) + Ind2-(aq) 1/KMg-Ind Mg2*(aq) + EDTA²-(aq) Mg-EDTA (aq) KMg-EDTA where Kca-EDTA, KMg-Ind and KMg-EDTA are the equilibrium constants for the complex formation. The over-all concentration of the Mg-EDTA complex near the endpoint is equal to KMg-EDTA /KMg-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: Ca2*(aq) + EDTA²-(aq) = Ca-EDTA (aq) Kca-EDTA Mg-Ind (aq) = Mg2*(aq) + Ind2-(aq) 1/KMg-Ind Mg2*(aq) + EDTA²-(aq) Mg-EDTA (aq) KMg-EDTA where Kca-EDTA, KMg-Ind and KMg-EDTA are the equilibrium constants for the complex formation. The over-all concentration of the Mg-EDTA complex near the endpoint is equal to KMg-EDTA /KMg-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 first picture, answer the question on the second picture.
Transcribed Image Text:When analyzing a 50-mL sample
for total-hardness, every milliliter
(1.00 mL) of EDTA titrant removes
an equivalent of 20.5 ppm CaCO3.
What is the total hardness of a
sample if a total of 22.54 mL titrant
was used?
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:
Ca2*(aq) + EDTA²-(aq) 2 Ca-EDTA (aq) KC-EDTA
Mg-Ind (aq) = Mg2*(aq) + Ind2-(aq)
1/KMg-Ind
Mg2*(aq) + EDTA²-(aq) Mg-EDTA (aq) KMg-EDTA
where Kca-EDTA, Kmg-Ind and KMg-EDTA are the equilibrium
constants for the complex formation.
The over-all concentration of the Mg-EDTA complex
near the endpoint is equal to KMg-EDTA /KMg-Ind-
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