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Does the temperature of 2 samples need to be the same?

  1. Dec 12, 2012 #1
    When testing 2 samples, does the temperature have to be the same with a pH meter?

    It says automatic temperature calibration...but that is per sample right?

    It seems like the pH seems to lower as the liquid gets cooler...is this normal?
     
  2. jcsd
  3. Dec 12, 2012 #2
    Depends on the meter, but yes, pH does vary with temperature. Consider that pKw is not always 14, for instance
     
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