Related Experiment Video
Updated: Jun 2, 2026

Nitrogen Compound Characterization in Fuels by Multidimensional Gas Chromatography
Published on: May 15, 2020
Characterization of condensed phase nitric acid particles formed in the gas phase
1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. Jialong@mail.iap.ac.cn
Abstract:
The formation of nitric acid hydrates has been observed in a chamber during the dark reaction of NO2 with 03 in the presence of air. The size of condensed phase nitric acid was measured to be 40-100 nm and 20-65 nm at relative humidity (RH) < or = 5% and RH = 67% under our experimental conditions, respectively. The nitric acid particles were collected on the glass fiber membrane and their chemical compositions were analyzed by infrared spectrum. The main components of nitric acid hydrates in particles are HNO3 x 3H2O and NO3- x H2O (x > or = 4) at low RH, whereas at high RH HNO3 x H2O, HNO3 x 2H2O, HNO3 x 3H2O and NO3- x xH2O (x > or = 4) all exist in the condensed phase. At high RH HNO3 x xH2O (x < or = 3) collected on the glass fiber membrane is greatly increased, while NO3- x xH2O (x > or = 4) decreased, compared with low RH. To the best of our knowledge, this is the first time to report that condensed phase nitric acid can be generated in the gas phase at room temperature.
More Related Videos
08:23Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
Published on: February 16, 2022
08:05Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
Related Concept Videos
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
2° Amines to N-Nitrosamines: Reaction with NaNO2
The Equilibrium Constant
Acids, Bases and Neutralization Reactions
Electrophilic Aromatic Substitution: Nitration of Benzene