Dear all, there exists various approaches to correlate conductivity to concentration. Please take a look at the following documents. My Regards

https://www.researchgate.net/publication/326597604_Quantifying_the_Relation_Between_Electrical_Conductivity_and_Salt_Concentration_for_Dilution_Gauging_Via_Dry_Salt_Injection

https://www.researchgate.net/post/How_is_it_possible_to_convert_conductivity_of_NaCl_solution_in_uS_to_its_salinity_NaCl_concentration_in_ppm

https://link.springer.com/article/10.1134%2FS0040601519080056

https://doi.org/10.1016/j.memsci.2017.10.024

https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100020

Drew Lilley

You can determine the total electrolyte content by evaporating the solution to dryness and weighing. The NaOH content can be determined by titration with standard acid. The electrolyte content cannot be determined by conductivity and pH.

If the problem is practical and NaOH and NaCl concentrations are high enough:

1. Titrate NaOH with HCl solution to end point (the final pH must be close to 7.0). This solution now contains only NaCl.

2. Measure the conductance of the final/titrated solution.

3. Calculate the conductance contribution of NaCl obtained from NaOH neutralisation (by using a table with specific conductances).

4. Substact the value calculated at 3 from the value measured at 2.

5. Convert the conductance calculated at 4 to NaCl initial concentration.

If the problem is only a theoretical case:

1. Measure pH of the solution and calculate NaOH content.

2. Calculate the contribution of NaOH to conductance by using a table with specific conductances.

3. Measure the conductance of the solution.

4. Substract the value calculated at 2 from the value measured at 3 to find the contribution of NaCl to solution conductance.

5. Convert the value calculated at 4 to NaCl concentration.

Dear all, there exists various approaches to correlate conductivity to concentration. Please take a look at the following documents. My Regards

https://www.researchgate.net/publication/326597604_Quantifying_the_Relation_Between_Electrical_Conductivity_and_Salt_Concentration_for_Dilution_Gauging_Via_Dry_Salt_Injection

https://www.researchgate.net/post/How_is_it_possible_to_convert_conductivity_of_NaCl_solution_in_uS_to_its_salinity_NaCl_concentration_in_ppm

https://link.springer.com/article/10.1134%2FS0040601519080056

https://doi.org/10.1016/j.memsci.2017.10.024

https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100020