By the way, I don't think Na metal if formed in the cathode. By electrode potential, H(+) is more easily reduced than Na(+), and therefore H2 is produced.
A way to demonstrate it is making an electrolysis of salt made of a less active metal, let's say... Fe o Al. These two, like Na or K, have lower potentials than hydrogen, so they shouldn't create any metal, either.
I agree, but it also has something to do with concentration. It doesn't show in the video, bit by adding Phenolphthalein to the solution, one can clearly see NaOH being formed. I did not include it in the video for simplificiation.
Also, Chlorine was formed at the anode, evident by the smell. This is also due to high concentration of salt.
is the bridge from fiberglass or organic fibers?
jpthecreaton 2 years ago
@jpthecreaton
Organic fibers. Filter paper.
donnelrj01 2 years ago
I have a test in school (9th grade) tmrw about this and this helped me a little, thanks :)
Mihker 2 years ago
How much was that data logger?
douro20 2 years ago
Comment removed
DextChar45 2 years ago
H2O+ CA
WICKEDSLIP15 2 years ago
very good
tiapon 3 years ago
Veldig bra video x)
FideliBomBom 3 years ago
By the way, I don't think Na metal if formed in the cathode. By electrode potential, H(+) is more easily reduced than Na(+), and therefore H2 is produced.
A way to demonstrate it is making an electrolysis of salt made of a less active metal, let's say... Fe o Al. These two, like Na or K, have lower potentials than hydrogen, so they shouldn't create any metal, either.
derkozten 3 years ago
I agree, but it also has something to do with concentration. It doesn't show in the video, bit by adding Phenolphthalein to the solution, one can clearly see NaOH being formed. I did not include it in the video for simplificiation.
Also, Chlorine was formed at the anode, evident by the smell. This is also due to high concentration of salt.
mabakken 3 years ago
Of course it creates an alkaline solution, but this is because of the overall action:
2Cl(-) + 2H2O --> H2 + Cl2 + 2OH(-)
Where electrons flow from chloride to hydrogen; Sodium ion is completely irrelevant in the electrolysis process.
derkozten 3 years ago
OK, I'm gonna go with you on this one, derkozten! :)
Once again, thank you for correcting me :)
mabakken 3 years ago
You're welcome. :) I'm just collaborating with your excellent video-work.
derkozten 3 years ago
Very nice one, as always.
The salt bridge... is it a piece of clothing, or paper? I assumed it was previously soaked in a salt solution.
It would've been very interesting to show the standard potential, I mean, making 1 M solutions of both metal ions.
derkozten 3 years ago
In this case, the salt bridge is a piece of paper soaked in a saturated solution of Potassium Nitrate.
I know it would be very nice to make standard solutions, but I decided to make it a bit easier for myself :)
mabakken 3 years ago
Very interesting. Thanks for sharing it.
evansp12 3 years ago
interesting, thanks :D
Atevra 3 years ago