Ah... fond memories of AP Chemistry from junior year in high school. One of the more enjoyable experiments that I did (besides making ice cream and playing with the centrifuge) was creating touch explosives. The actual chemical that we formed was nitrogen tri-iodide (NI3). This is stable when it's in a solution, but when it dries, the activation energy is extremely low, making this compound very unstable. There is a great deal of exothermic energy released, as well as the formation of two gases (nitrogen and iodine), which creates the explosion. The purple gas from the explosion is the iodine.

The memory I have is of Mrs. Green (the chemistry teacher) lending us a blue feather to set off the explosion. This feather has been with her for many years, almost as many as she's been teaching. We wanted to show the low activation energy for this reaction, so we figured the feather would be best suited to show this. We attached the feather to the end of a meterstick and gently touched the feather to the dried nitrogen tri-iodide.

Bang!

People jumped. Mrs. Green looked upset. As she should have.

There were pieces of blue feather floating around in the purplish gas.

Get ready to die.

This article is a prime example of the Anarchist's Cookbook's failure to provide accurate information. A small amount of applied chemistry will hopefully give you a more accurate idea.

The Explosive

Most people will tell you that this compound described above is Nitrogen Tri-Iodide (NI3), a stupidly unstable explosive. High explosives, such as NI3, normally produce large quantities of gas very quickly. Nitroglycerine, for example, is reasonably explosive because of the Nitrogen, Carbon, Hydrogen and Oxygen contained within, which can reasonably easily change itself into some variation on more stable compounds, such as Nitrogen gas, Carbon Dioxide gas, and so forth. In the case of NI3, the gas produced will be Iodine - 1.5 moles of gas produced for every mole of the substance.

In fact, these people would be slightly wrong. This method of creating the explosive will actually give you an ammonia complex which will surround the nitrogen and make it much larger, making the compound slightly more stable. I'd imagine that this is also the reason why dissolving the compound will make it slightly safer to handle - the ligand in this case being water. This does not detract from the fact that it is stupidly dangerous to handle. Search around on the internet for a moment, paying attention to educational websites (think kinetic stability vs thermodynamic stability), and you will find videos of carefully controlled samples of this compound being detonated with a feather. Anyone foolish enough to pick up a largish sample of dry NI3 (Technically [N(NH4)6)]I3) with their bare hands and attempt to disturb this paper, by scruching it into a ball as suggested in the article, or just breathing on it too hard, will probably lose their face.

Some brief Calculations:

Say we have a 5 gram sample of a substance we will assume to be pure NI3. This would be roughly a tablespoon. Now, using high school chemistry, Moles = Mass/RFM.

Moles = 5/(127*3+14) = 0.0127 Moles. Not a lot, right?

When it explodes, it will all decompose, because it's very unstable. It will decompose via the following equation.

NI3 -> N + 1.5 I2

As you'll all recall, at standard temperature and pressure a mole of gas will occupy 24 litres. So;

Volume = (0.0127*1.5)*24 = 0.457 Litres.

This does not sound like a lot. But I've based my assumptions on the idea that I'm using the minimum amount I could obtain without getting a negligibly small amount, which people hoping to play a prank probably wouldn't do. And 0.457 litres is still 457 cubic centimetres. Remember those little blocks you played with, in primary school? 1cm3 each? Imagine 450 of them appearing, blowing off your hands and destroying your eyes. Even if you survive, enjoy your lungful of iodine gas, which will temporarily blind you and make you choke instead of scream for help.

Webelements have their own NI3 video: http://www.webelements.com/webelements/elements/media/moov/NI3.mpg


Further details/corrections would be appreciated.

Log in or registerto write something here or to contact authors.