So if we assume that behind all activity of hydrogen ion in water solution is hydronium (H3O+) with activity coeficient γ then the concentration of hydronia in „mol/L" should be calculated as (10‑pH/γ)*ρ/MM, where ρ is solution density and MM is molar mass of solution.
We present 0"2-0"4 resolution images of the rest-frame 188 and 419$\mu$m dust continuum and the CO(6-5), H2O(211-202) and J=2 H2O+ line emission. We also report the detection of H$_2^{18}$O in this source. The dust continuum and molecular gas emission are resolved into a nearly complete ~1"5...
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