There are many questions about the relationship between pH, conductivity, CO2 and the purity of water.
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When I check the purity of ultrapure water in a beaker, it does not match the purity on the water system display. Is there a problem with my water system?
Measuring conductivity, resistivity, and pH in ultrapure water leads to frequent questions and “lab myths” about the measurements and what they mean to the lab.