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Pottery grade materials purity (NiO and K2Cr2O7)
The nickel oxide most likely is not NiO, but Ni2O3. If it is black, then it is Ni2O3, if it is green ...
3-6-2019 at 11:32
by: woelen
PbI2 and electrolysis questions
Electrolysis of a solution of PbI2 will not work in practice. theoretically, you get I2 at the anode ...
3-6-2019 at 11:20
by: woelen
sharing Awesome Chemical Pictures (Read first comment)
That sample of uranyl nitrate is beautiful.

@Ubya: Uranyl ion has uranium in its +6 oxidation sta ...
3-6-2019 at 03:13
by: woelen
Whats the best way to obtain Sodium Bisulfite NaHSO3?
As far as I know, solid sodium bisulfite does not exist. The product they sell as bisulfite is the m ...
2-6-2019 at 23:59
by: woelen
Preparation of cyclo-hexasulfur
I have done more searching on internet about hexasulfur. There is not much info, but the following i ...
31-5-2019 at 10:28
by: woelen
Metal oxides
For eBay it is most practical to have PayPal. It works very well and I think more than 50% of all my ...
29-5-2019 at 06:59
by: woelen
Metal oxides
The material you show in the aukro website really looks like nickel sulfate. Nickel sulfate has quit ...
29-5-2019 at 04:11
by: woelen
Metal oxides
Cr2O3 is very inert. The only way to release the Cr(3+) ions is by dissolving it in molten NaOH or i ...
28-5-2019 at 23:57
by: woelen
Reduction of Phenyl-2-nitropropene with Al/Hg failed. Why??
Let me add one thing.

Some compounds have no general use in home chemistry or other hobby applic ...
28-5-2019 at 23:49
by: woelen
The moment (or moments) that made you realize you had a passion for chemistry
As a kid I already had interest in all kinds of technology and science. I read books about space, pl ...
27-5-2019 at 10:56
by: woelen
Looking over the border: EU-Regulations
I boil down small quantities and do experiments on a ml-scale. Do you really think that someone, who ...
27-5-2019 at 09:38
by: woelen
Shelf life of some organic reagents.
For many many chemicals the shelf life is limited, not due to its own decomposition, but due to reac ...
26-5-2019 at 23:02
by: woelen
sharing Awesome Chemical Pictures (Read first comment)
That's interesting. How much solvent did you need for this extraction? And what solvent did you use? ...
26-5-2019 at 22:44
by: woelen
Equilibrium of chromate and dichromate
Yes, the chromate condenses to dichromate and this produces OH(-), which is neutralized by H(+) ions ...
26-5-2019 at 22:39
by: woelen
Equilibrium of chromate and dichromate
I did an experiment with chromate and dichromate, in which a nice equilibrium reaction is demonstrat ...
26-5-2019 at 10:30
by: woelen
Looking over the border: EU-Regulations
If these new regulations become active, then of course they are quite annoying for doing experiments ...
24-5-2019 at 07:27
by: woelen
Last chemical order?
Good point, I changed the title.
23-5-2019 at 13:10
by: woelen
Do we need a separtate forum for lab safety and waste treatment?
I created the new section and moved all threads, mentioned a few posts ago. I used j_sum1's second l ...
23-5-2019 at 11:49
by: woelen
Manganese redox chemistry in strongly alkaline media (hypomanganates, manganates)
Great experiments and good home science!

This type of experiments I definitely will try myself so ...
23-5-2019 at 11:32
by: woelen
Sulfur experiment ideas
If you have some Se, besides the sulphur, you could make some SxSe8-x by heating sulphur in a test t ...
22-5-2019 at 22:54
by: woelen
Unknown blue/grey copper II salt?
I think so, but probably with some peroxide contamination and some chloride contamination.
22-5-2019 at 22:48
by: woelen
Unknown blue/grey copper II salt?
The dark red powder is copper metal. At the strongly acidic conditions of your experiment you certai ...
22-5-2019 at 04:45
by: woelen
Mercuric Chloride Synthesis Success?
This does not work well. HgCl2 is only sparingly soluble. It may prevent complete dissolution of all ...
21-5-2019 at 10:53
by: woelen
What to do with a bottle of 60% HF?
Why do you order chemicals when you do not know what to do with it? Especially HF is really nasty. T ...
21-5-2019 at 02:04
by: woelen
Mercuric Chloride Synthesis Success?
This is a nice synthesis. Your product must be quite pure. The yellow color is not strong and a tiny ...
20-5-2019 at 23:22
by: woelen
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