What is a pH Meter?: What is a pH Meter?
An instrument that measures the H+ ion concentration (pH) of a solution using an ion sensitive electrode which will ideally respond to one specific ion, in this case H+ The pH of a solution is the negative logarithm of the H+ ion concentration A typical modern pH meter has a glass and reference electrode in one tube How Does a pH Meter Measure H+ Concentration?: How Does a pH Meter Measure H+ Concentration? The pH meter has two electrodes in one tube, glass and reference electrode. A saturated KCL and HCL solution is contained in a tube which is inside of an outer tube that will have contact with the solution to be measured. This outer tube has a double glass bulb with NA+ which makes an ion specific electrode. When measuring the pH of a solution, a salt bridge forms. The NA+ ion, not H+, crosses the glass membrane of the pH electrode and allows for a change in free energy which is measured by the pH meter as the concentration of H+. Calibrating a pH Meter: Calibrating a pH Meter Make
