| Popis: |
Vapour pressures of aqueous solutions containing ammonia and carbon dioxide, ammonia and hydrogen sulphide or ammonia, carbon dioxide and hydrogen sulphide, have been determined at temperatures from 20-60° C. Dissolved hydrogen sulphide is present almost completely in the form of ammonium hydrosulphide. Dissolved carbon dioxide is present in the form of carbonate, bicarbonate and carbamate of ammonium. The experimental vapour pressure data are interpreted from the viewpoint of the ionic equilibria in the solutions. The numerical values of the equilibrium constants have been derived. A method is described enabling one to calculate the vapour pressure for arbitrary compositions of the solutions. Diagrams are given for the vapour pressures of the two-component system ammonia-carbon dioxide, as a function of the total ammonia content and the ratio R (= total carbon dioxide/total ammonia). From these diagrams also the vapour pressures of the three-component system ammonia-carbon dioxide-hydrogen sulphide can be derived approximatively. |
