Acide nitrique

Superiority:

The Acide nitrique, with the CAS registry number of 12507-77-6, is also known as  Aqua fortis. This chemical's molecular formula is HNO₃ and molecular weight is 63.01. What's more, its IUPAC name is Nitric acid. Acide nitrique is a highly corrosive and toxic strong acid. Colorless when pure, older samples tend to acquire a yellow cast due to the accumulation of oxides of nitrogen. If the solution contains more than 86% Nitric acid, it is referred to as fuming Nitric acid.

Physical properties about Acide nitrique are: (1)# of Rule of 5 Violations: 0; (2)ACD/BCF (pH 5.5): 1; (3)ACD/BCF (pH 7.4): 1; (4)#H bond acceptors: 4; (5)#H bond donors: 1; (6)#Freely Rotating Bonds: 0; (7)Polar Surface Area: 66.05 Å²; (8)Index of Refraction: 1.409; (9)Molar Refractivity: 9.606 cm³; (10)Molar Volume: 38.82 cm³; (11)Surface Tension: 58.652 dyne/cm; (12)Density: 1.623 g/cm³; (13)Enthalpy of Vaporization: 37.722 kJ/mol; (14)Boiling Point: 83 °C at 760 mmHg; (15)Vapour Pressure: 49.828 mmHg at 25 °C.

Preparation of Acide nitrique: 
(1)Acide nitrique is made by reacting Nitrogen dioxide (NO₂) with water.
3NO₂ + H₂O → 2HNO₃ + NO
(2)Normally, the Nitric oxide produced by the reaction is reoxidized by the Oxygen in air to produce additional Nitrogen dioxide. Bubbling Nitrogen dioxide through Hydrogen peroxide can help to improve acid yield.
2NO₂ + H₂O₂ → 2HNO₃