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Jb
Joined: 08 Jun 2005 Posts: 7761 Location: 91� N
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dpack
Joined: 02 Jul 2005 Posts: 46061 Location: yes
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dpack
Joined: 02 Jul 2005 Posts: 46061 Location: yes
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tahir
Joined: 28 Oct 2004 Posts: 45614 Location: Essex
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Slim
Joined: 05 Mar 2006 Posts: 6595 Location: New England (In the US of A)
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dpack
Joined: 02 Jul 2005 Posts: 46061 Location: yes
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Posted: Fri Jun 19, 20 6:15 pm Post subject: |
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i prefer gloves, goggles and lab coat(improvise is fine if it seems practical)for small amounts and full acid suit if 20000 litres of saturated are involved even if they are tank to tank by pipe
if you are dissolving it into water and/or fats in a bowl tis best to have a decent breeze, mask or fume cupboard.
the aerosol it can make is not nice to breathe or look through for a short while
drown out used kit in water before you clean it
etc
a spec of crystal or flake on the skin can be not noticed until you have a nasty lesion, in solution it has the potential to be well messy especially in the eyes
although it is "domestic" it is really quite nasty to work with, i prefer "acid reactions", "on fire or potentially bangy", "high pressure" and "toxic stuff" to using caustic with basic ppe and domestic science protocols
a small mistake is potentially life changing, unlikely to die
big mistake can be fatal
cat 3 risk imho but please be careful and sensible.
advice from an old, almost undamaged/or damaging chemist, a few near misses though:wink: |
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15840
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15840
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buzzy
Joined: 04 Jan 2011 Posts: 3708 Location: In a small wood on the edge of the Huntingdonshire Wolds
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dpack
Joined: 02 Jul 2005 Posts: 46061 Location: yes
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Posted: Wed Jun 24, 20 11:32 am Post subject: |
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Mistress Rose wrote: |
Another science experiment your children may like is chromatography. You will need either some blotting paper, coffee filters, or some other fairly absorbent paper that won't fall apart and some water washable felt tip pens.
Draw a line with one colour pen on the paper, then hang or hold it, so that the line is parallel to and just above a bowl of water. As the water rises up the paper, the ink will split into the different colours used to make it. The best one is black as I remember as that contains a good range, but some others are pretty interesting too. Should keep them occupied for some time, and you can explain the theory behind it to them to make it educational. |
i have done it professionally by assorted means, kitchen/garden science is very easy and educational with basic kit and skills.
plant material
grind it with a bit of sand, extract the juices with a splash of vodka, spot it (maybe a few times letting it dry between coats, run in a tank of mixed solvents(surgical spirit and nail varnish remover might be an option)
water based felt tip pen dye mixes and inks in general run ok in plain water on blotting paper or similar, the substrate should have a unidirectional or very directional nature
jam jar will do for small bits but a "tank" to ensure minimal evaporation is useful for decent seperations
have you got a low power ie safe uv torch?
that can be loads of fun with chromatographs, nowt to see at all until you light it up
or chemical"developer" to bind with and show up the things you have seperated
in a while i could guide you through "build your own GLC", that is loads of fun and i guess a raspberry would substitute for a bbc/D in the control gear with little bother
another fun analysis thing, titrations are very educational if used well, learn loads about chemistry and maths* from titrations
again some basic kitchen kit and maybe a dosing syringe would be adequate kit at a push.
there are many plant pigments that will indicate Ph for instance
*STEM is a package:wink: |
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15840
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Posted: Thu Jun 25, 20 7:05 am Post subject: |
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Henry, I have a vague idea I did do something like that with a coffee filter to get the rings, but it was over 30 years ago, so can't really remember.
The first gas chromatograph I came across was a very Heath Robinson affair at college. That sort of thing was just coming in, and one of the lecturers built this amazing 'thing' at the back of one of the labs out of miles of glass tubing. We tried it, and after about an hour, nothing had come through, so we gave up, as even the inventor of the device agreed that it hadn't worked.
As you say, a very basic titration idea using a liquid from plants (I understand red cabbage water works quite well if you have it) as an indicator might be quite educational. |
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dpack
Joined: 02 Jul 2005 Posts: 46061 Location: yes
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