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conduction of electricity in salt and sugar solutions.
Posted: 18 Nov 2013, 12:25
by Rita
Hi All
Year 7 to do this prac. Using transformer and light to see difference in conduction in salt and sugar solutions.
Which electrodes would be best to use?
Thanks in advance
Rita
Re: conduction of electricity in salt and sugar solutions.
Posted: 18 Nov 2013, 13:25
by smiley
Well carbon is safest. Although I wouldn't use a transformer with Yr 7's. We use a simple battery circuit, with alligators, a mes (little light globe stand bizzo) and carbon electrodes. There are fairly simple conductivity rigs out there, using wire probes, that can work in a test tube, for example. There are even ones that use an LED instead of a globe.
The main issue is don't leave the electrodes in the solutions for very long, especially a salt solution, because you'll start making chlorine and poisoning the little cherubs.
Unless, of course, you want....oh no, ahem, I mean, of course you don't want that to happen
Re: conduction of electricity in salt and sugar solutions.
Posted: 18 Nov 2013, 14:03
by Ocker
Good one Smiley!
Glad to see you are in top form!
Re: conduction of electricity in salt and sugar solutions.
Posted: 18 Nov 2013, 15:21
by smiley
Ahh Ocker, if only. But yes, they didn't irradiate my sense of humour, thankfully.
Re: conduction of electricity in salt and sugar solutions.
Posted: 19 Nov 2013, 09:08
by Rita
We have always used transformers with year 7.
Rita