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pH is the measure of the concentration of H+ ions in a solution. When adding pure water to a solution that already has a reduce concentration of Hydronium versus Hydroxide ions (i.e. a basic solution), the resulting solution will have a larger total volume and relatively the same amount of Hydronium ions, thus increasing the overall pH of the solution.
This is all in a perfect environment of course with no gas exchange occurring between the two solutions. In a real world scenario, carbon dioxide will dissolve in pure water forming carbonic acid which will lead to a reduction in pH of the RODI solution since it has zero buffer capacity. Adding the reduce pH RODI solution to the saltwater would cause a reduction in the overall pH of the resulting solution.
pH is the measure of the concentration of H+ ions in a solution. When adding pure water to a solution that already has a reduce concentration of Hydronium versus Hydroxide ions (i.e. a basic solution), the resulting solution will have a larger total volume and relatively the same amount of Hydronium ions, thus increasing the overall pH of the solution.
This is all in a perfect environment of course with no gas exchange occurring between the two solutions. In a real world scenario, carbon dioxide will dissolve in pure water forming carbonic acid which will lead to a reduction in pH of the RODI solution since it has zero buffer capacity. Adding the reduce pH RODI solution to the saltwater would cause a reduction in the overall pH of the resulting solution.