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Concentration of hydrogen ions in a solution is called:
Acid concentration
and
pH = - log10(hydrogen ions concentration, in mol/l)
Concentration of ozone is about 380 ppm. This is the natural range of ozone.
The concentration of pure water is 55 molar. In other words, 1 liter of water holds 55 moles of H2O
Yes it does.
The concentration of uranium in soils is considered as normal in the range 0,3 μg/kg -- 10 mg/kg.