Answer to Question #278002 in Organic Chemistry for Wilfried

Question

When 10 drops of concentrate sulphuric acid are added to 10 drops of concentrate nitric acid in a test tube while shaking and cooling the mixture under cold the mixture of acid were added to 5 drop of water an the mixture seperate itself in a funnel. Sujets how the layers çan be treated to remove residual of acid

Answer 1

The acid residue from the Mixtures of nitric acid and sulfuric acid containing in excess of 70% sulfuric acid are demonstrated by the addition of sufficient sulfur dioxide to such mixtures to convert the nitric acid to gaseous nitrogen oxides and vaporize them from the solution in which they are formed. The process is particularly valuable for the treatment of spent nitration acids.