The pH value or pH is the negative of the base 10 logarithm of the activity of hydrogen ions H+. A pH electrode reports the pH and is sensitive to the activity of H+. In dilute solutions, the hydrogen ion activity is approximately equal to the hydrogen ion concentration. The symbol pH stems from the term potentia hydrogenii.
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The O2k-FluoRespirometer (or other O2k configuration, Series B or higher) combined with the O2k-pH ISE-Module enables measurement of pH in the 2 mL O2k-Chamber (included with all O2k configurations).