The local drinking water has been found to contain the following mass concentrat
ID: 1821904 • Letter: T
Question
The local drinking water has been found to contain the following mass concentrations(mg/L) of major ionic species. Other data reveal the total dissolved solids (TDS) content to be
43.7 mg/L. The pH is 8.0.
Anions Cations
Cl- 8.1 Ca2+ 6.7
SO4
2- 6.3 Na+ 2.4
F- 0.4 Al3+ 0.1
NO3
- 0.8 K+ 0.08
HCO3
- 16.3 Fe2+ 0.06
a. Use the principle of electroneutrality to determine whether a significant ion is missing
from the list.
b. Make an educated guess about what missing ion would be and compute its mass
concentration in this water. Can you confirm or reject your guess using the measured
TDS? Explain.
Explanation / Answer
What are the sources of the above two questions
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