The West Virginia Water Research Institute reported the following water quality

Question

The West Virginia Water Research Institute reported the following water quality measurements for the Monongahela River monitoring station at Mile 89 for August 2010.

pH = 7.79
ALK = 59.9 mg/L as CaCO3 Na+ = 44.7 mg/L
Ca2+ = 39.8 mg/L

Mg2+ = 10.6 mg/L

Cl? = 15.9 mg/L

SO2? = 146 mg/L 4

(a) Determine the concentration of dissolved inorganic carbon (DIC) in the water in mol/L and in mg/L, assuming that HCO–3 is the only significant contributor to ALK and DIC.

(b) Check the cation–anion balance for this analysis.

Explanation / Answer

alkanlinity as CaCO3 = 59.9 mg / L

So moles /L of CaCO3 = 59.9 / 100=0.599 X 10^-3 moles / L

So moles of CaCO3 = moles of HCO3- = 0.599 X 10^-3 moles / L

so total dissolved inorganic ion =0.599 X 10^-3 moles / L

the strength in mg / L = molarity X molecular weight of HCO3- = 0.599 X 10^-3 X 61 g / L = 36.53 mg / L

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