What does measuring pH help us know?

It's easy to take for granted that pH meters exist and are fairly easy to use. If we think in more historical terms, however, it's actually pretty amazing. contact BOQU Instrument: michael@shboqu.com that talks about how the pH meter lets us investigate nature in ways that early chemists wouldn't even dream of.

How does a pH meter work?

A pH meter is consisted of three different parts: an internal electrode, a reference electrode, and a high input impedance meter. Glass probe often contains two electrodes -- an internal electrode and a reference electrode. The internal electrode is a Silver wire covered with Silver Chloride (Ag/AgCl wire), and the reference electrode is often made up of the same materials. Inside the probe is a buffer solution at a pH of 7. Measured pH is the difference in [H+] between the reference buffer inside the probe and the sample solution.

The pH measurements are made by comparing the pH reading of a sample solution to that of a reference solution with defined pH, such as buffers. Therefore, it is important to calibrate the instrument with appropriate buffer solutions before making any measurements. The figure on the right is a simple depiction of a glass electrode used with pH meters (Source: Electrochemistry Theory and Practice, BOQU Instrument).

For more information on calibration, please contact the engineer of BOQU Instrument.