Hey guys, so I have a project on the pH meter. Basically on what it is, what it's used for, how it works, and what principles does it run on. It is a group project but we can't seem to figure out some points and we've become very confused! Mainly, it's how it works. We researched and understood that the pH meter has electrodes and it kind of works like a thermacouple thermometer. There are 2 electrodes (a pH electrode and a reference electrode). The pH electrode, according to us, is a glass electrode that has a membrane made out of some metal. When the glass electrode is put in the tested solution to determine the pH level, the hydrogen ions go in the glass electrode and then in turn some metal ions from the membrane go into the solution? And then there is a electric potential difference that is sent to the voltmeter that helps convert it into pH units. But out real problem is, is what use is the reference electrode. We've done a lot of research on it and everywhere just says that it's to provide a stable electric potential. But how? And why?