Exercise 20
The following table contains the results of an analysis of a water sample with the concentrations of various ions (column A) given in milligrams per liter (mg/L) in column B.
- Use the periodic table at https://ptable.com/#Properties↗ to determine the atomic weight of each ion and enter the atomic weights in column C.
- Use the atomic weight of each ion to convert the concentration from mg/L to molarity (mmol/L) and enter the answers in column D.
- Enter the valence charge for each ion in column E.
- Use the valence charge and values from column D to calculate the concentration in milliequivalents per liter (meq/L)
| A | B | C | D | E | F |
| Solute | Measured Concentration (mg/L) | Atomic weight(g) | Molarity (mmol/L) | Valence (charge) | meq/L |
| [latex]{Ca}_{}^{2 +}[/latex] | 92 | ||||
| [latex]{Mg}_{}^{2 +}[/latex] | 34 | ||||
| [latex]{Na}_{}^{+}[/latex] | 8.2 | ||||
| [latex]K_{}^{+}[/latex] | 1.4 | ||||
| [latex]{Fe(III)}_{}^{}[/latex] | 0.1 | ||||
| [latex]{HCO}_{3}^{-}[/latex] | 325 | ||||
| [latex]{SO}_{4}^{2 -}[/latex] | 84 | ||||
| [latex]{Cl}_{}^{-}[/latex] | 9.6 | ||||
| [latex]{NO}_{3}^{-}[/latex] | 13 |