Composition of aqueous solutions of ammonium sulphate and sulphuric acid
Abstract
Concentrations of SO2–4 and HSO–4 anions in aqueous solutions of ammonium sulphate and sulphuric acid have been determined by means of Raman spectroscopy. The molar ratio P0=mH2SO4/m(NH4)2SO4 and the total molality mT were in the range 1.0–2.5 and 3.38–18.21 mol kg–1, respectively. The results obtained have been used to establish the dependences of the stoichiometric dissociation quotient Qm=mH+mSO–4/mHSO–4 and of the fraction α of total sulphate on the molar ratio P0 and the total molality mT of the solution at 20 °C.