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  #1  
Old 07-09-2006, 08:41 PM
GIB GIB is offline
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Default Need suplies

i am new to this site but it seemed a usefull place to get help

I find my chemestry class boring and i informed my teacher of this, he said that next year i could do some other more exiting experiments "if and only if" (as he put it) i can find an interesting experement involving something called "potassium nitrate".
heres my delema.
I need as much information as possable on this thing
like what it does, how its used, where it comes from who disscovered it... that kind of thing.
also i need experement ideas.
so if anyone can help me out i would be gratefull
thx
GIB
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Old 07-11-2006, 10:02 AM
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The chemical compound potassium nitrate is a naturally occurring mineral source of nitrogen. It is a nitrate with chemical formula KNO3. When it burns, it shows a bright pink to purple color.

Its common names include saltpetre (from Medieval Latin sal petrae: "stone salt" or possibly "Salt of Petra"), American English salt peter, Nitrate of potash and nitre. The name salt peter is also applied to sodium nitrate.

Other names: Saltpetre, Nitrate of potash
Molecular formula: KNO3
Molar mass: 101.1 g/mol
Appearance: white solid
CAS number: [7757-79-1]
Density and phase: 2.1 g/cm3, solid
Solubility in water: 35.7 g/100 ml (25 °C)
Melting point: 334 °C
Boiling point: 400 °C decomp.

History
The first organic nitrate was discovered by Italian chemist Ascanio Sobrero in 1847. He was a chemistry professor at the University of Torino and worked under Théophile-Jules Pelouze who himself had worked on discovery of explosives.
Sobrero called the discovered compound pyroglycerin and surprisingly in private correspondence as well scientific papers advocated against its use considering it too dangerous to handle and use. He described strong headache after putting nitroglycerin on the tongue.

In 1849 German Constantin Hering, tested nitroglycerin in healthy volunteers and he also observed headaches with its use. As a homeopath he thought it a good remedy for headaches (reasoning that "like cures like").

Later, in 1859 Frederick Guthrie worked with amyl nitrate and noticed that accidental inhalation of it led to face and neck flushing and heart palpitations. It was linked with vasodilatation. This inspired T. Lauder Brunton to used amyl nitrate in coronary heart disease. In 1867 he published in the Lancet a scientific paper On the Use of Nitrite of Amyl in Angina Pectoris (1867;ii:97-98) . Another therapeutic observation was tolerance with repeated use.

Use
In medicine, organic nitrates such as glyceryl trinitrate, isosorbide mononitrate (ISMN) and isosorbide dinitrate (ISDN) are particularly useful for prevention and treatment of angina pectoris. However they can cause a dangerous reaction if taken within 24 hours of taking sildenafil citrate (Viagra) or similar drugs. A list is available at ATC code C01#C01DA Organic nitrates.

Nitrate poisoning (acquired methemoglobinemia) can be treated with Methylene blue.

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Old 07-12-2006, 09:41 AM
GIB GIB is offline
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Default Thx!!

thanks alot!
this is alot of useful information and im very greatful

P.s
would you also know where i can aquire some?
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