TheChemiKid - 21-12-2013 at 04:55
I was wondering whether anyone would be interested in doing a collaboration video for youtube on color change reactions?
If you can, please reply saying what you can do.
We can work out details later.
Here are some ideas:
KMnO4 chameleon
Halloween reaction (Silver or Mercury)
Anything that is cool or stunning.
bismuthate - 21-12-2013 at 05:05
Well obviously we'll need some copper chemistry. Also some iron thiocyanate and this
http://www.youtube.com/watch?v=_gyzhvMLImg
My compliments to mrhomescientist on the excellent video.
If you're welcoming suggestions I have plenty more.
plante1999 - 21-12-2013 at 05:19
There is one thing I saw in my life which really marked me by its beauty. Red cinnabar burning making a blue flame and condensing mercury, dripping
onto the receiver.
woelen - 21-12-2013 at 07:16
I certainly am willing to make some videos of color changing reactions. There are many spectacular ones:
- Solution of acidified KMnO4, which reacts with a solution of a sulfite: Immediate disappearance of deep purple color.
- Solution of acidified K2Cr2O7, which reacts with a solution of a sulfite: Immediate change of color, from bright orange to a beautiful green with a
bluish hue.
- Pouring orange vapor of CrO2Cl2 on a slightly acidified 0.1% solution of H2O2: Gives beautiful heavy deep blue 'schlieren' of CrO5, appearing on the
surface and sinking to the bottom.
- Heating of thermochromic salts (e.g. HgI2), which gives remarkable reversible changes of color from very bright orange/red to bright yellow.
- Heating of a solution of CoCl2 in appr. 5% HCl. Gives a change from pink to deep blue and on cooling down the liquid becomes pink again.
There are many more, these are a few which come to my mind which are not that hard to do. Of course there also are the pH-indicators which, when
combined, can be used to move through a range of colors while the pH is changed slowly.
TheChemiKid - 21-12-2013 at 07:41
If anyone wants to make videos, and can make the videos, please U2U me, and we can discuss it in further detail.
Eddygp - 21-12-2013 at 07:53
Hmmm, a few reactions come to mind. Is it only water-based chemistry or can it be dry chemistry too, e.g. Al + I2?
TheChemiKid - 21-12-2013 at 07:56
Any chemistry will work, as long as it is colorful. The Al + I2 should be a great reaction.
Mailinmypocket - 21-12-2013 at 08:37
Ferroxyl indicator is neat if you make a time lapse video of a piece of iron sitting in it. Somewhat similar to the oh so famous "Nurdrage" video of a
"bleeding nail", except blueish. Are you looking only for fast color changes though?
TheChemiKid - 21-12-2013 at 08:40
No, any reaction will work. I can always speed up the video later if it is too long.
The video may need to be compressed to send it to me.
Bot0nist - 21-12-2013 at 08:45
A simple one is to drop a small piece of copper pipe or wires into a cold solution of H<sub>2</sub>O<sub>2</sub> and sulfuric
acid. Copper sulfate solution is rapidly formed and the clear solution becomes darker and darker blue. You can see the pretty pictures thread #1 for a
more detialed writeup with pics.
TheChemiKid - 21-12-2013 at 08:48
Would people be able to upload their videos using either dropbox, google drive, or mediafire?
TheChemiKid - 21-12-2013 at 14:38
Here is a list of experiments already taken:
copper acetate
copper chloride
KMnO4 Chameleon
Cabbage indicator
copper iodide
iron ferricyanide
copper nitrate
copper oxide
copper hydroxide
tetrabromocuprate complex
a few flame tests.
roasting cinnabar
ferroxyl indicator
copper sulfate
Aluminum and Iodine
If you have any other ideas, please contact me.
Brain&Force - 23-12-2013 at 15:59
Try neodymium and holmium salts, whose colors depend on the type of lighting. For holmium this can be quite dramatic.
Erbium and ytterbium burn bright green when lit. In the IR spectrum ytterbium is incredibly bright. Samarium and europium burn red, and scandium,
yttrium, lanthanum, cerium, neodymium, and terbium yellow. As to praseodymium, gadolinium, dysprosium, holmium, thulium, and lutetium, I have no idea
(Sorry, I'm lanthanide crazy!)
For the flame tests consider rubidium and cesium, which burn reddish-violet and blue respectively.
Also try the iodine clock, which turns black out of the blue (pun intended).
Vanadium goes through several color changes as it's reduced by zinc amalgam.
Vaporizing iodine is always fun.
Silver salts are light sensitive and will often darken in the light.
Cobalt and nickel have some interesting coordination chemistry, see woelen's thread on ethylenediamine complexes. The complex
bis(ethylenediamine)copper(II) perchlorate is not only dark blue, but highly energetic, and it burns with a bluish-green flame.
Look at woelen's site for more examples.
[Edited on 24-12-2013 by Brain&Force]
Zyklon-A - 23-12-2013 at 16:04
Iodine clock reaction.
plante1999 - 23-12-2013 at 16:12
I actually have some problem making the glass set up, as I'm out of Glass tubing, plus, I'm also out of sodium hydroxide to make the wash
solutions.... I will see what I can do for the week-end.