ALINITY DETERMINATION IN WATER BY MOHR METHOD Most precipitation titration uses standard silver nitrate solution as titrant. Mohr method is one example of Argentometric titration method, the other two are Fajans and Volhard methods. It uses CrO42- as indicator in the titration of chloride ion with silver nitrate. In any solution containing chloride and chromate ions, the chloride ions are precipitated by silver ion first before the chromate ion. In this exercise, salinity of natural water will be based upon the chlorinity of the sample. Salinity is a measure of the salt content of seawater. It is directly proportional to the amount of chloride ion in water, and is computed as: S (ppt) = 1.805 [ppt Cl−] + 0.03 QUESTIONS 1: Why should the pH of the water sample be adjusted to 7-8? 2: Does the value for the salinity correspond to the type of water sample used in the exercise (i.e.
ALINITY DETERMINATION IN WATER BY MOHR METHOD Most precipitation titration uses standard silver nitrate solution as titrant. Mohr method is one example of Argentometric titration method, the other two are Fajans and Volhard methods. It uses CrO42- as indicator in the titration of chloride ion with silver nitrate. In any solution containing chloride and chromate ions, the chloride ions are precipitated by silver ion first before the chromate ion. In this exercise, salinity of natural water will be based upon the chlorinity of the sample. Salinity is a measure of the salt content of seawater. It is directly proportional to the amount of chloride ion in water, and is computed as: S (ppt) = 1.805 [ppt Cl−] + 0.03 QUESTIONS 1: Why should the pH of the water sample be adjusted to 7-8? 2: Does the value for the salinity correspond to the type of water sample used in the exercise (i.e.
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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ALINITY DETERMINATION IN WATER BY MOHR METHOD
Most precipitation titration uses standard silver nitrate solution as titrant. Mohr method is one example of Argentometric titration method, the other two are Fajans and Volhard methods. It uses CrO42- as indicator in the titration of chloride ion with silver nitrate. In any solution containing chloride and chromate ions, the chloride ions are precipitated by silver ion first before the chromate ion. In this exercise, salinity of natural water will be based upon the chlorinity of the sample. Salinity is a measure of the salt content of seawater. It is directly proportional to the amount of chloride ion in water, and is computed as: S (ppt) = 1.805 [ppt Cl−] + 0.03
QUESTIONS
1: Why should the pH of the water sample be adjusted to 7-8?
2: Does the value for the salinity correspond to the type of water sample used in the exercise (i.e., seawater)?
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