What is pH?

Released on = October 6, 2005, 11:55 pm

Press Release Author = Kelilong Electron Co.,Ltd

Industry = Industrial

Press Release Summary = Definition: The negative logarithm of hydrogen ions in a solution.

Press Release Body = What is pH?
pH is one of the most common analyses in soil and water testing. An indication of the sample’s acidity, pH is actually a measurement of the activity of hydrogen ions in the sample. pH measurements run on a scale from 0-14, with 7.0 considered neutral. Those solutions with a pH below 7.0 are considered acids, and those above 7.0 are
designated bases. The pH scale is logarithmic, so a one unit change in pH actually reflects a ten-fold change in the acidity. For instance, orange juice (pH 4) is ten times more acidic than cottage cheese, which has a pH of 5. Many industries rely heavily on pH for their processes to work properly, or to maintain expensive equipment. Breweries maintain the pH between 4.2 and 4.6 to keep infectious bacteria from breeding during the fermentation process. In many industrial applications, if the pH is too low the water may corrode metal equipment, but if it is too high scaling may result. pH can be measured visually or electronically. Visual comparisons use a pH indicator whose color change reflects the pH, which is then matched to a color standard. pH meters, such as the pH 5, simplify the pH test. A probe is placed in the sample, and the pH is read directly from the meter. While the meter is very easy to use, the electronics within the meter are more complex. After the pH probe measures the millivolts of potential between the reference electrode and the pH electrode, the meter converts this reading to pH units using the Nernst Equation:

where Ex

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