News tagged with nitrate
The nitrate ion is a polyatomic ion with the molecular formula NO− 3 and a molecular mass of 62.0049 g/mol. It is the conjugate base of nitric acid, consisting of one central nitrogen atom surrounded by three identically-bonded oxygen atoms in a trigonal planar arrangement. The nitrate ion carries a formal charge of -1. This results from a combination formal charge in which each of the three oxygens carries a −2⁄3 charge, whereas the nitrogen carries a +1 charge, all these adding up to formal charge of the polyatomic nitrate ion.
This arrangement is commonly used as an example of resonance. Like the isoelectronic carbonate ion, the nitrate ion can be represented by resonance structures:
Almost all inorganic nitrate salts are soluble in water at standard temperature and pressure. A common example of an inorganic nitrate salt is potassium nitrate (saltpetre).
In organic chemistry a nitrate (not to be confused with nitro) is a functional group with general chemical formula RONO2 where R stands for any organic residue. They are the esters of nitric acid and alcohols formed by nitroxylation. Examples are methyl nitrate formed by reaction of methanol and nitric acid, the nitrate of tartaric acid, and the inaccurately-named nitroglycerin (which is actually an organic nitrate compound, not a nitro compound).
Like organic nitro compounds (see below) both organic and inorganic nitrates can be used as propellants and explosives. An example of the use of inorganic nitrate was classical gunpowder. In all these uses the thermal decomposition of the nitrate yields molecular nitrogen N2 gas plus considerable chemical energy, due to the high strength of the bond in molecular nitrogen. Especially in inorganic nitrate reactions, oxidation from the nitrate oxygens is also an important energy-releasing process.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
(Medical Xpress)—Scientists have long puzzled over why "bad" bacteria such as E. coli can thrive in the guts of those with inflammatory bowel disease (IBD), causing serious diarrhea. Now UC Davis resear ...
Inflammatory disorders Feb 07, 2013 | 5 / 5 (6) | 0 |
(Medical Xpress)—Athletes competing this summer have benefited from an unlikely ingredient to fuel their Olympic and Paralympic success.
Health Sep 20, 2012 | 5 / 5 (1) | 0
(Medical Xpress) -- Previous research has suggested that the consumption of cured meat may have a possible link to pancreatic cancer risk however a new study published in the American Journal of Epidemiology shows that t ...
Cancer Jul 05, 2011 | 2.5 / 5 (2) | 0 |
Virginia Commonwealth University researchers have found that nutrient supplementation, like the kind that is found in leafy greens, spinach and lettuce, may reduce the damage to the heart caused by a powerful anti-cancer ...
Cardiology May 19, 2011 | 5 / 5 (1) | 0