
%0 Journal Article
%A Bayliss, NS 
%A Watts, DW 
%T The Spectrophotometry of Nitrate Solutions in Aqueous Sulphuric Acid
%J Australian Journal of Chemistry
%D 1963/12/01
%V 16
%N 6
%P 943-946
%K 
%R https://doi.org/10.1071/CH9630943
%U https://www.publish.csiro.au/paper/CH9630943 
%X The ultraviolet spectra of solutions of potassium nitrate in aqueous sulphuric acid have been studied. Three absorptions, those due to the species NO3-, HNO3, and NO2+, have been found. From this study a semiquantitative picture has been developed of the distribution of the total nitrate between these three species. It was found that in the sulphuric acid concentration range 0-15% by weight, the dissolved nitrate existed as nitrate ion and that from 15-70% sulphuric acid, nitrate ion, and molecular nitric acid were present in comparable amounts. In the sulphuric acid concentration range 72-82% nitric acid accounted for the total dissolved nitrate and as the sulphuric acid concentration was increased from 82-90% nitric acid was converted to nitronium ion. 
