Exploration 10D. What combination of simple salts would yield a given composite analysis? Once the concentrations of all significant ions have been established, we are in a position to speculate about ways in which that particular combination of ion concentrations could have originated. For example, a mixture containing Na*, Ca²*, Cl and HCO3 could have come from a mixture of NaCl and Ca(HCO3)2 or from a mixture of NAHCO3 and CaCl2 or from other combinations of these four salts. More than one combination may be possible, but some combinations are ruled out by the data while some combinations are more likelv than others. Exercise 10.4. Propose a mixture of specific salts and determine the mass (in mg) of each of these salts that should be dissolved in one liter of water to yield the concentrations of cations and anions described in Exercises 10.1-10.3. FW g/mol Concentration, ppm Ion Concentration, mM Na+ 1.08 23 24.8 Ca2+ 2.01 40 80.2 Mg2+ 0.96 24 23.3 НСОЗ- 5.594 61 341.7 Cl- 0.46 35.5 16.0 F- 0.0187 19 0.356 NO3- 0.149 62 9.22 SO, 0.399 96 38.3 pH 7.9 Total anions 7.02 TDS calc 533.88 Total cations 7.02 TDS expt 434.3

Exploration 10D. What combination of simple salts would yield a given composite analysis? Once the concentrations of all significant ions have been established, we are in a position to speculate about ways in which that particular combination of ion concentrations could have originated. For example, a mixture containing Na, Ca², Cl and HCO3 could have come from a mixture of NaCl and Ca(HCO3)2 or from a mixture of NAHCO3 and CaCl2 or from other combinations of these four salts. More than one combination may be possible, but some combinations are ruled out by the data while some combinations are more likelv than others. Exercise 10.4. Propose a mixture of specific salts and determine the mass (in mg) of each of these salts that should be dissolved in one liter of water to yield the concentrations of cations and anions described in Exercises 10.1-10.3. FW g/mol Concentration, ppm Ion Concentration, mM Na+ 1.08 23 24.8 Ca2+ 2.01 40 80.2 Mg2+ 0.96 24 23.3 НСОЗ- 5.594 61 341.7 Cl- 0.46 35.5 16.0 F- 0.0187 19 0.356 NO3- 0.149 62 9.22 SO, 0.399 96 38.3 pH 7.9 Total anions 7.02 TDS calc 533.88 Total cations 7.02 TDS expt 434.3

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.1QAP

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