Definition: The term "acidometer" is a device used to measure the concentration of hydrochloric acid or other acids in a solution, with the purpose of determining if the solution is safe for use. A typical acidometer uses a cathode (a part of the metal electrode) made from aluminum and copper combined with a cathodic film which is protected by a plastic membrane that allows ion movement. The device consists of an electrochemical cell with a lead anode, an electrolyte (aqueous solution) and a glass or stainless steel cathode. The electrochemical reaction takes place on the metal electrode, and when a proton moves from one side to the other across the cathodic film, it releases energy in the form of light or heat. This is measured by observing whether there is a change in the luminosity of the illuminated part of the electrode. The value of this luminosity can be used to determine the concentration of the acid or the pH (pH) of the solution. The specific ionizing radiation from the proton is captured and recorded as an electrical signal, which is then amplified by a voltage multiplier to provide the actual concentration value.

acidometer