Why no2 is brown

This formed the orange-brown NO 2. Most certainly, it didn't contain air, which would have reacted with the NO before more air was admitted. Some students had suggested the gas was hydrogen because of the concentrated acid, but this experiment neither proves nor disproves its presence.

I strongly recommend that teachers do this experiment with their students and not merely relate the phenomenon! Here is my take on the gas riddle. Gas A is nitric oxide.

In test tube 3, the nitric oxide reacted with oxygen in the air forming nitrogen dioxide — hence the brown colour — and finally in test tube 4 the nitrogen dioxide dissolved in water giving a colourless solution. I do have a question. You seem to emphasize using basic bromothymol blue bb ; why not just neutral bb which would have a green colour?

Nice demo, definitely in a fume hood for the initial production then the rest could be in a well-ventilated room. The mysterious gas labeled A at position 2 in the graphic is nitric oxide NO , perhaps mixed with residual atmospheric nitrogen gas N2.

First, the required data: web searches or perusal of textbooks of descriptive inorganic chemistry, the CRC handbook and MSDS information will inform the reader of the following:.

Ask your question Media enquiries. Biodiversity Information System for Europe. Climate Adaptation Platform. Copernicus In Situ. Copernicus in situ component. Copernicus Land. Copernicus land monitoring. European Industrial Emissions Portal. Forest Information System for Europe. Information Platform for Chemical Monitoring. Can you give a reasonably detailed explanation for this from electronic structure theory?

Previous queries were not answered because the question posed was deemed to be too broad. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why is nitrogen dioxide brown? Ask Question. Ozone is one of the major secondary pollutants.

You can read more about ozone pollution in our blog: Why do I have an ozone pollution problem and what can I do about it? Indoor NO 2 levels are a result of both indoor and outdoor sources. While indoor NO 2 is produced by unvented heaters and gas stoves, high outdoor NO 2 levels originating from local traffic and other combustion sources can influence indoor levels. Air pollution is a serious problem and we should all be concerned. Worldwide, more deaths per year are linked to air pollution than to automobile accidents.

NO 2 is both a primary and secondary pollutant. Air pollution impacts everyone but some of us are more susceptible than others: children and seniors, people with existing lung and heart conditions, people working and exercising outdoors. To combat the serious health effects it is important to find out more about air pollution, such as areas of heavy concentration, elements of composition and cause. To get this information, comprehensive air quality monitoring must be undertaken using air monitoring devices, such as shown below.

These can be portable, ideal for checking pollution hot-spots or personal exposure, or fixed monitors, which measure the air continuously so you know when NO 2 levels are high. Both measure the air in real-time giving you accurate readings to make informed decisions.

Portable monitors to measure NO 2. Aeroqual makes sensors and equipment for air quality monitoring. Monitoring NO 2 and other pollutants is easy as See our portable outdoor air quality monitors to learn more.

She enjoys guiding them to find the right solution to help them understand the air they breathe. About Sitemap Privacy. Toggle navigation. Last Updated: Mar 24, Twinky Tagle.