Calculate the "approximate” alkalinity (in milligrams per liter as CaCO3) of a water containing 120 mg.L-¹ of bicarbonate ion and 15.00 mg · L-¹ of carbonate ion.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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**Calculating Approximate Alkalinity in Water Samples**

To calculate the "approximate" alkalinity (expressed in milligrams per liter as CaCO₃) for a water sample, consider the following ion concentrations:

- **Bicarbonate Ion Concentration**: 120 mg/L
- **Carbonate Ion Concentration**: 15.00 mg/L

These concentrations represent the ions present in the water that contribute to its alkalinity, primarily through bicarbonate (HCO₃⁻) and carbonate (CO₃²⁻) ions.

To compute the total alkalinity, you can use the equivalent weight conversions for each ion to CaCO₃ and add their contributions. The calculation involves converting the mass of each ion to an equivalent mass of calcium carbonate, a standard expression in water chemistry.
Transcribed Image Text:**Calculating Approximate Alkalinity in Water Samples** To calculate the "approximate" alkalinity (expressed in milligrams per liter as CaCO₃) for a water sample, consider the following ion concentrations: - **Bicarbonate Ion Concentration**: 120 mg/L - **Carbonate Ion Concentration**: 15.00 mg/L These concentrations represent the ions present in the water that contribute to its alkalinity, primarily through bicarbonate (HCO₃⁻) and carbonate (CO₃²⁻) ions. To compute the total alkalinity, you can use the equivalent weight conversions for each ion to CaCO₃ and add their contributions. The calculation involves converting the mass of each ion to an equivalent mass of calcium carbonate, a standard expression in water chemistry.
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