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Looking for good teaching contexts regarding the conductivity of NaCl-solutions

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Tlowlow:
Hey,
first time poster here. As the title states, I am looking for contexts to teach the conductivity of ionic solutions. I thought of smartphones that get damaged when dropped into the sea or that "new" Na/NiCl2 accumulator, but the first one can't really be solved in class and the second one is too complex. My students are in the 8th grade and I was wondering if you know a good example, where conductivity is used to achieve its means.

Thanks a lot!
Cheers and greetings from Germany.

AWK:
https://www.youtube.com/watch?v=UHYWIM8AbPE


Use save current-voltage!

Tlowlow:
This is good advice - I know that Mythbuster episode as well  ;D.

Fortunately, my students won't have to use such a device. They use conductometers or I got some batteries with LED diodes soldered on. 

AWK:
My students build Daniell's galvanic cells, then use a voltmeter to check their voltage before and after the salt bridge connection (usually 1.08 V). The diode on one galvanic cell shines very weakly. Then students  connect two cells in series - the voltage increases twice and the diode shines clearly.

Tlowlow:
Oh that is a good activity for serial circuits and conductivity.

I think my problem is my inexperience. I'm supposed to have a context for what I teach that gives the students a problem to solve... something like a bath murder mystery maybe. Under normal circumstances I would probably present the conductivity similarly to that YT link you provided me with and let the students guess what the reasons for the shown phenomenon is and go on from there. However, there will be people watching this lesson and I need to give the students a "real life" context.

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