The pH meter and conductivity meter are used to measure and monitor the pH and conductivity of the solution on the stir plate during the course of a titration. For potentiometric experiments, the pH meter turns into a voltmeter. Probes for the two meters are kept in the rack to the left of the meters, and the probes can be dragged and then placed in the beaker on the stir plate. Note that the pH meter must be calibrated with the pH 4 and pH 10 standard buffer solutions before obtaining meaningful results. The meters are turned on by clicking on the red/green lights on the meters (or the switches in the Live Data tab), which will, in turn, open the Live Data views for each meter. These views are used to display the readings for each meter.
The Save Data button in Buret section is used to save the volume, pH (or potential), and conductivity to the lab book. Details on saving data to the lab book are given below.
The pH probe must be calibrated with the pH 4 and pH 10 buffer solutions before the meter will display the correct pH. This is done by placing the probe in the pH 4 buffer and then pressing the pH 4 button and repeating the process for the pH 10 solution except clicking on the pH 10 button. The calibration must be performed each time the pH meter is turned on.