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Bad elements from ebay again
I found another bad one:

https://www.ebay.nl/itm/100-grams-High-Purity-99-99-Antimony-Sb-Metal-Lu ...
19-6-2018 at 07:11
by: woelen
Mixture of HCl+H2O2 with transition elements
The bubbles at the copper wires are oxygen. This is due to catalytic decomposition of H2O2 by the co ...
17-6-2018 at 23:49
by: woelen
Methylamine question
[rquote=521982&tid=84171&author=PirateDocBrown]Don't answer homework questions. Redirect to ...
17-6-2018 at 10:07
by: woelen
Methylamine question
In order to solve such questions, you need to know the density of a 30% solution, but in this case i ...
16-6-2018 at 10:52
by: woelen
Last chemical order?
I obtained a set of simple vinyl compounds:
- allyl alcohol, CH2=CH-CH2OH
- allyl bromide, CH2=CH- ...
14-6-2018 at 12:18
by: woelen
Extraction of potassium chlorate from old weedkiller
I would convert it to KClO3. Just dissolve all of it in as little as possible of water, allow insolu ...
13-6-2018 at 02:30
by: woelen
How do I recrystallize ferric chloride?
The reason that no FeCl3 from aqueous solution is extracted into an organic layer is due to the ioni ...
12-6-2018 at 05:27
by: woelen
Ferrophosphorus General
There are two types of phosphides.

One type has phosphide ions and has well-defined stoichiometr ...
10-6-2018 at 12:47
by: woelen
Robo challenge event: 2D pattern matching needed
I'm quite limited with choice of hardware. We have to use a Raspberry PI with a standard 5 MP camera ...
2-6-2018 at 13:05
by: woelen
Robo challenge event: 2D pattern matching needed
I also have been thinking of a blinking LED (e.g. at 20 Hz), but this introduces a lot of other diff ...
1-6-2018 at 11:06
by: woelen
Vandium pentoxide substitute
The element vanadium is quite rare and it is not easily purified. The metal also is quite expensive ...
31-5-2018 at 12:07
by: woelen
Robo challenge event: 2D pattern matching needed
Finally, if no beacon is in view, or just part of it, then the software must tell that there is no b ...
31-5-2018 at 11:48
by: woelen
Robo challenge event: 2D pattern matching needed
At a distance of 15 meters (maybe even a little more), the beacon becomes quite small in the image. ...
31-5-2018 at 11:42
by: woelen
Robo challenge event: 2D pattern matching needed
In the run for this post, the robot is much closer to the beacon. It is 3 meters or so from the beac ...
31-5-2018 at 11:37
by: woelen
Robo challenge event: 2D pattern matching needed
The beacon can be represented by the following points:

Plot these in an (x,y)-frame and you see t ...
31-5-2018 at 11:30
by: woelen
Last chemical order?
[rquote=519951&tid=9890&author=Cryolite.]Woelen, are you interested in parting with any of t ...
31-5-2018 at 00:54
by: woelen
Robo challenge event: 2D pattern matching needed
I am organizing a robo challenge event in which mobile wheeled robots (non-holonomous 3-wheeled, two ...
30-5-2018 at 02:15
by: woelen
Last chemical order?
I had a nice purchase: a little more than 70 grams of a chemical, sold as Ru(OH)3 to me, for a littl ...
30-5-2018 at 00:56
by: woelen
Give up j_sum1
What a sad little boy this is :(

I really feel sorry for this guy. He has no life at all. Just an ...
29-5-2018 at 05:54
by: woelen
Blue tungstic or molybdic acid ?
The brown/orange compound is a peroxo complex of H2O2 and molybdate. I have some Na2MoO4 and when I ...
25-5-2018 at 11:12
by: woelen
Electrochemical production of chloroform
I do not think this is a useful way of making chloroform. It is interesting though, but only from an ...
25-5-2018 at 11:09
by: woelen
Electrochemical production of chloroform
If you do this experiment on a small scale (e.g. electrolysis at 1 A for just an hour or so), then I ...
24-5-2018 at 02:11
by: woelen
1-chloroacetaldehyde
. . . and what do you want us to do with your post? What's your point or question?
23-5-2018 at 23:38
by: woelen
Weird side product when making copper acetate
You can easily find out whether the product contains copper(I) or not. Add some of the material to a ...
23-5-2018 at 22:43
by: woelen
Weird side product when making copper acetate
Yes, I think AJKOER is right (or close to it). These reactions finally lead to formation of basic pr ...
22-5-2018 at 23:21
by: woelen
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