Dear Sir. Concerning your issue about the determination of the change in ionic strength of the system after using NaOH or HCl to change the pH of the system. A buffer solution is a solution that is able to resist pH change after the addition of acid or base. Buffers are made by mixing large amounts of weak acids or bases together along with its conjugate. These solutions are important for many chemical applications, especially applications that are sensitive to pH changes such as biological systems. Typically, it is more important to determine the ionic strength of a buffer solution rather than the buffer’s concentration. Determining ionic strength accurately defines pH of solutions by estimating concentrations of all ions in the solution. I think the following below links may help you in your analysis:

https://sciencing.com/calculate-ionic-strength-buffer-solution-7728381.html

http://www.tau.ac.il/~chemlaba/Files/conductometry-titrations.pdf

Thanks

Hello Mr Isam,

Thank you for your answer. But my question is how to find the change in ionic strength AFTER pH change and for clarifications I am not trying to avoid change in pH. I am actually inducing pH change so that the biopolymers can react.