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

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When testing two samples with a pH meter, it is important to note that temperature can affect pH readings. pH typically decreases as the temperature of the liquid decreases, which is a normal phenomenon. Most modern pH meters feature automatic temperature calibration, but this calibration is conducted for each individual sample. Therefore, while it is not strictly necessary for both samples to be at the same temperature, it is advisable to be aware of the temperature's influence on pH readings, as the pKw value can vary and is not always 14.
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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?
 
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AHVincent said:
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?

Depends on the meter, but yes, pH does vary with temperature. Consider that pKw is not always 14, for instance
 

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