What is the pH meter's slope range following calibration?
After the calibration is completed, the slope should be above 95%, and after the electrode has been used for a long time, the slope of the electrode after calibration should be at least 85%.
The calculation of the slope is related to the electrode measuring the potential of the solution you prepared.
For the three standard buffer solutions, two are usually selected for calibration. If all three buffer solutions are involved in the calibration, the slope will be different accordingly.
The pH meter works on the principle of a galvanic battery. The electromotive force between the two electrodes of the galvanic battery is based on Nernst's law, which is not only related to the properties of the electrode itself, but also related to the concentration of hydrogen ions in the solution. There is a corresponding relationship between the electromotive force of the primary battery and the concentration of hydrogen ions, and the negative logarithm of the concentration of hydrogen ions is the pH value.
