I would like to know if nitrate has a speciation diagram in water or it has only one molecular state at all pH values from 1 to 14 ?

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Paul Milham

The answer may be concentration dependent but first look at the pK value in water

Arne Andersen

Nitric acid has a pKa of -1.5. This means that it will be ionized under all conditions. https://owl.oit.umass.edu/departments/OrganicChemistry/appendix/pKaTable.html Another issue is that the "nitrogen system" is sensitive to red-ox reactions: NH3/NH4+, N2, NO2-, NO3-

Apart from the reference to the table of pKa: https://owl.oit.umass.edu/departments/OrganicChemistry/appendix/pKaTable.html the answer is based on my general knowledge of nitrogen chemistry.