Q1: What is a pH electrode?
A1: The pH electrode is also called the pH probe pH sensor. The pH electrode is the part of the pH meter that is in contact with the substance to be measured and is used to measure the electrode potential.
Q2: Why do pH electrodes need to be soaked?
A2: The pH electrode must be soaked before use, because the pH bulb is a special glass membrane with a thin hydrated gel layer on the surface of the glass
membrane, which can only interact with the H+ ions in the solution under fully wet conditions. the response to. At the same time, after soaking the glass
electrode, the asymmetric potential can be greatly reduced and tend to be stable.
Q3: What is a reference electrode?
A3: An electrode with a known and constant electrode potential that does not respond to the activity of hydrogen ions in solution is called the reference electrode. Reference electrodes include mercurous sulfate electrodes, calomel electrodes, and silver/silver chloride electrodes. The most commonly used are calomel electrodes and silver/silver chloride electrodes. The role of the reference electrode in the measurement cell is to provide and maintain a fixed reference potential, so the requirements for the reference electrode are that the potential is stable and reproducible, the temperature coefficient is small, and the polarization potential is small when current flows.
Tips: What is a pH-indicating electrode?
An electrode that responds to the activity of hydrogen ions in a solution and the electrode potential changes accordingly is called a pH-indicating electrode or pH-measuring electrode. pH-indicating electrodes are available as hydrogen electrodes, antimony electrodes, and glass electrodes, but the most commonly used electrode is glass. Glass electrodes are made up of glass stubs and a hydrogen ion-sensitive glass membrane made up of special ingredients. The glass membrane is generally in the shape of a bulb, which is filled with an internal reference solution, inserted into the internal reference electrode (usually silver/silver chloride electrode), sealed with an electrode cap to connect the lead wire, and fitted with a socket, then it becomes a pH indicator electrode.