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Technical Documentation: Domain of a Logarithmic pH Sensor

As a trainee technician at a municipal wastewater treatment plant, you are drafting a safety and calibration manual for the facility's digital pH sensors. These sensors monitor the acidity of treated water using the basic logarithmic function f(x)=log10(x)f(x) = \log_{10}(x), where the input variable xx represents the hydrogen ion concentration in moles per liter.

To ensure all operators understand the mathematical limitations of these sensors, write a short technical paragraph explaining the domain of this basic logarithmic function. In your response, you must:

  1. Recall and state the mathematical domain of this basic logarithmic function, explaining what this means for the possible values of the hydrogen ion concentration xx.
  2. Describe how this domain restriction is represented visually on the sensor's calibration graph in relation to the vertical yy-axis.
  3. Express this domain formally in standard interval notation.

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Updated 2026-06-17

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