In order to graph the values obtained during the experiments for measuring pH, a multimeter was used to obtain the voltage of the different solutions. However, the small area of the sensor did not allow a successful measurement. Figure 20 shows the process to be followed for measuring the pH using the equipment's sensor.
The values obtained for each solution using the sensor were considered as mistaken because the value obtained was the same for the three solutions tested. Therefore, the experiment for the sensor was not successful. Nevertheless, further in the course, the digital pH meter was added to the process and the measurements were completed.
Figure 2 shows the ideal calibration curve using the pH sensor and the adjustment of the mentioned curve.