The relationship between pH and conductivity
Thread Content
Is the correlation between pH value and conductivity accurate? Is the error large?
There is a corresponding relationship, which allows for an approximate determination of the pH value, but it is not accurate.
There is a certain relationship between conductivity and pH. In acids, pH is inversely proportional to conductivity; in bases, it is directly proportional. However, they cannot be converted into one another; if an accurate value for conductivity or pH is desired, the only way is to use a conductivity sensor and a pH meter to measure them separately. These two parameters are also relatively easy and quick to detect, and the instruments used are simple as well.
Check the solution composition. In a typical solution, various cations and anions are present, so the conductivity is somewhat high; however, such a solution can be either acidic or alkaline, thus the pH value has little relation to conductivity. However, in the case of a pure water system, it is possible to calculate the concentrations of hydrogen ions and hydroxide ions based on the pH value, and thereby use this information to relate it to the conductivity data as well.