Oelen (CC BY-SA 3.0) via Commons WikimediaĢ.’Nitric acid 70’By Aleksander Sobolewski via Wikimedia Commons, (CC BY-SA 4. Available here Image Courtesy:ġ.’Nitric acid fuming’By W. “Nitric Acid.” National Center for Biotechnology Information. “Nitric Acid.” Wikipedia, Wikimedia Foundation, 31 July 2018. The key difference between fuming nitric acid and concentrated nitric acid is that the fuming nitric acid forms a colorless, yellowish or brownish fuming whereas the concentrated nitric acid usually does not form a fume but a very high concentration of this acid may give off-white colored fumes. There are two forms of nitric acid with a high concentration of HNO3 they are fuming nitric acid and concentrated nitric acid. Summary – Fuming Nitric Acid vs Concentrated Nitric Acid The following infographic presents more details on the difference between fuming nitric acid and concentrated nitric acid. The color does not go that deep, so sanding afterwards can result in uneven coloration. In addition to that, this acid usually does not form a fume but the very high concentration of this acid may give off-white colored fumes. The lowest concentration of this acid is 68%. Concentrated nitric acid is simply a solution containing more nitric acid in less water. The lowest concentration of this acid is 90%. Moreover, it forms a colorless, yellowish or brownish fume. What is the Difference Between Fuming Nitric Acid and Concentrated Nitric Acid?įuming nitric acid is a commercial grade of nitric acid that has a very high concentration and a high density. It is useful as a storable oxidizer and a rocket propellant. It contains a maximum of 0.5% nitrogen dioxide. Thus, it is very close to anhydrous nitric acid, and it is available as 99% solution. Therefore, we consider the white fuming acid as the purest form of nitric acid having less than 2% sometimes, no water at all. The chemical formula of this compound is HNO 3-xNO 2.įurthermore, there are two major forms of this acid as white and red fuming nitric acid. The fume of this acid rises off the surface of the acid this lead to its name, “fuming”. Therefore, this acid solution has gaseous molecules in combination with water there is no water in it. It forms a colorless, yellowish or brownish fuming liquid that is highly corrosive. We can prepare this liquid via adding excessive nitrogen dioxide to nitric acid. Side by Side Comparison – Fuming Nitric Acid vs Concentrated Nitric Acid in Tabular Formįuming nitric acid is a commercial grade of nitric acid that has a very high concentration and a high density. But in the preparation of fuming nitric acid, we can prepare it by adding excess nitrogen dioxide to nitric acid. The reaction between nitrogen dioxide and water forms nitric acid. Either way, it has nitric acid molecules dissolved in water. A non-destructive fuming technique that can be used on porous and non-porous surfaces. Moreover, it can have either a dilute or concentrated chemical nature. Pack about 1/2 teaspoon of iodine crystals into the fuming kit/chamber. Nitric acid is a very corrosive and dangerous acid that has the chemical formula HNO3. The chart below characterizes the differences between a chemical fume hood and a biosafety cabinet.The key difference between fuming nitric acid and concentrated nitric acid is that the fuming nitric acid forms a colorless, yellowish or brownish fume whereas the concentrated nitric acid usually does not form a fume but a very high concentration of this acid may give off-white colored fumes. The images below show basic examples of the airflow design for the two types of cabinets. The HEPA filter in the exhaust system of a biosafety cabinet will effectively trap all known infectious agents and ensure that only microbe-free exhaust air is discharged from the cabinet (i.e., 99.97% of particles 0.3 µm in diameter and 99.99% of particles of greater or smaller size). Smoke is a collection of airborne particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. Biosafety cabinets have high-efficiency particulate air (HEPA) filters while chemical fume hoods do not. an amount of gas or vapour that smells strongly or is dangerous to inhale. While chemical fume hoods and biosafety cabinets look similar and both protect laboratory workers from laboratory hazards - their purpose, function, and operation differ significantly.Ī chemical fume hood is designed to remove chemical fumes and aerosols from the work area while a biosafety cabinet is designed to provide both a clean work environment and protection for employees who create aerosols when working with infectious agents or toxins.Ī chemical fume hood protects the user while a biosafety cabinet protects the user, the environment, and the material. Both chemical fume hoods and biosafety cabinets are specialized types of laboratory equipment.
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