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Dr.Bob
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Another nice trick is to tape a small test tube to the side of commonly used reagents/solvents that will hold a Pasteur pipette inside it. Then leave
one in there such that it can be reused each time a few drops are needed. This only works for chemicals that evaporate and don't go bad, but it is
great for DCM, TLC solvents, etc that you need a small amount of often.
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ScienceHideout
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Paper Towel Trick
When I pour dangerous things, I always do this:
I take a piece of paper towel, and fold it in half.
I then keep folding it in half the same way until I have a 12"x1" strip of paper towel.
I wrap it around the bottle above the label, but below the neck.
Pour the acid.
Check the towel for moisture. If it has acid on it, I wipe the side of the bottle.
It is a good trick. The only problem I can see is if you have trouble holding the bottle and paper towel in the same hand. It might be slippery! If
that is a problem, tape the paper towel where the two ends meet, or put a rubber band around it (so you just have to worry about holding the bottle!).
Hope that helps!
hey, if you are reading this, I can't U2U, but you are always welcome to send me an email!
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Pyro
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Quote: Originally posted by Twospoons ![](images/xpblue/lastpost.gif) | Why not keep a pipette specifically for each chemical you need to dispense? No contamination that way.
I always use a glass pipette, with a rubber squeeze bulb for my acid. No choice really - ever tried to pour a few ml from a 10 litre bottle of
nitric?
[Edited on 5-2-2008 by Twospoons] |
i buy all my acids in 5l containers, i just buy 1 litre bottles for a buck and a half each, and pour a litre into that bottle, its a lot easier to
handle, especially with H2SO4 because its so heavy
all above information is intellectual property of Pyro. ![:D](./images/smilies/biggrin.gif)
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Endimion17
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Huh, I was very surprised so many of you had no idea about the glass rod thing. It's quite unbelieveable because that's essential for doing laboratory
work. ![:o](./images/smilies/shocked.gif)
We learned these things as kids in elementary schools, along with making round/fluted filter papers, using a cork borer and cutting glass tubing. It's
in every elementary school chemistry textbook and repeats itself in highschool and college manuals.
![](http://i135.photobucket.com/albums/q136/endimion17/pokusi/lijevanje.png)
Every lab I've ever worked in has like a ton of these rods lying around.
Of course, it doesn't work for mercury and works poorly for bromine, obviously because of their atomic/molecular structure. Water is very polar, so it
sticks to the glass nicely.
Seriosuly, invest in a laboratory manual. Buy the actual book. Paper book, that's the one that is flammable. ![:D](./images/smilies/biggrin.gif)
It's a lot better than downloading it.
You can't do chemistry while being educated over the Internet. I own few manuals and I assure you, things you can find over the Google are less than
10% of the stuff you can learn from manuals.
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