Abstract
1.1. The influence of the presence of potassium acid sulphate and sulphuric acid on the boiling-points of aqueous solutions of nitric acid has been studied at atmospheric and diminished pressures.2.2. It has been found that, while the presence of potassium acid sulphate brings about little or no change in the composition of the mixture of maximum boiling-point, additions of sulphuric acid to aqueous solutions of nitric acid cause a decrease in the nitric acid content of the mixture of maximum boiling-point, the decrease being greater the greater the addition of sulphuric acid.3.3. Diminishing the pressure has also been found to cause a slight further decrease in the nitric acid content of the mixture of maximum boiling-point.4.4. The results obtained show clearly why aqueous solutions of nitric acid can be concentrated to over go per cent. by distillation with concentrated sulphuric acid.
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