My teammates and I measured the conductivity of salt over time and with those results we determined TDS of what we think is NaCl as a product (ions Na+ and Cl-) using TDS=conductivity * 0.64 in which 0.64 is the conversion factor but we don't know how to find the initial concentracion of NaCl. We know the volume of water, the conductivity, the amount of salt added, density and the total time of dissolution. Should we consider that same TDS as the initial concentration? If say so, NaCl as a reactant shouldn't be decreasing over time?
To find the initial concentration of NaCl, calculate it using the mass of salt added divided by the volume of water, rather than using TDS. The TDS reflects the total dissolved ions over time, while the initial concentration remains constant until the salt is fully dissolved.
And how can we find the concentrations of both ions Na+ and Cl- as separate products? Because at some point if we consider TDS as those concentrations of ions, the initial concentration we obtained using the method you recommend us is lower than what we have in TDS. For example, we obtained 47.67 mol NaCl/m^3 as our initial concentration but at minute 3 we already have 51.46 mol Cl-/m^3, like can we have values that are greater than the initial concentration?
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