Question

What are the activities (effective concentrations) of ALL the ionic species for the water sample represented in the following table? Constituents mg/L Cations Sodium 16,470 Potassium 120 Calcium 2010 Magnesium 885 Barium 45 Strontium 135 Total iron Dissolved iron Anions Chloride 31,730 L 0.5 Sulphate Bicarbonate

Answer 1

The effective concentrations are calculated in terms of g/100mL.

Here it is given in mg/L. So if we divide the amount by 10 it will be mg/100mL, then followed by division with 1000 it will convert mg to gm. So as a result we can divide whole amount by 10000 then we will get effective concentration.

1 mg/L = 0.0001 g/100mL

So by this calculation effective concentration of given ions are

Constituents       Effective concentration (g/100mL)

Sodium                    1.647

Potassium                0.012

Calcium                    0.201

Magnesium               0. 0885

Barium                     0.0045

Strontium                 0.0135

Total iron                  0.0015

dissolved iron           0.00029

Chloride                   3.173

Sulphate                 L 0.000005

Bicarbonate             0.0071