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KI + HCl + sample + Starch -> yellow colour, why?
Using KI + HCl is not sufficient to produce iodine I2. The yield is miserable. It is also necessary ...
20-9-2021 at 09:12
by: Maurice VD 37
Why technetium and promethium doesn't have a stable isotope?
There is a law in nuclear physics stating that if two nuclides are isobar (same mass number) and ne ...
17-9-2021 at 10:56
by: Maurice VD 37
Help with Cs2cucl4 (cesium tetrachlorocuprate II) preparation
Don't use CuCl ! You should start from CuCl2 !!
What do you want to do with this compound ? Cesium ...
16-9-2021 at 06:28
by: Maurice VD 37
KI + HCl + sample + Starch -> yellow colour, why?
Are you sure of the quality of your starch ? Because the word HONIG means honey in German. And honey ...
16-9-2021 at 06:21
by: Maurice VD 37
Nickel Acetate from Nickel Chloride
Are your sure that a reaction did happen in your mixture ? It the reaction did proceed as you said, ...
14-4-2021 at 11:34
by: Maurice VD 37
Nickel Acetate from Nickel Chloride
Are you sure that HCl has been eliminated from your mixture ? Who knows ? Maybe NiCl2 is still here ...
13-4-2021 at 11:42
by: Maurice VD 37
Something strange happened to my CuSO4 solution
1. Dehydrated copper sulfate can of course rehydrate in the presence of water.
2. Dissolving copper ...
13-2-2021 at 03:18
by: Maurice VD 37
Acid mixtures that dissolve gold
What do you mean by "being better to dissolve gold" ? All these mixtures will produce chlorine gas. ...
12-2-2021 at 13:49
by: Maurice VD 37
Something strange happened to my CuSO4 solution
Your precipitate may be partially dehydrated copper sulfate. I see that you have concentrated you so ...
10-2-2021 at 13:38
by: Maurice VD 37
K2CO3 / KOH from Wood ashes ?
The analysis I have reported describe the composition of the solid ashes, before any leaching or tre ...
10-2-2021 at 13:30
by: Maurice VD 37
K2CO3 / KOH from Wood ashes ?
The wood ashes have the following composition :
40 - 70 % CaCO3
5 - 10% K2CO3
5 - 10 % Na2CO3
5 ...
9-2-2021 at 13:29
by: Maurice VD 37
Any way to tell if there is bromobenzene in benzene?
Instead of TLC, I would use gas chromatography (GC)
6-2-2021 at 05:22
by: Maurice VD 37
Reaction of Ammonium Chloride and Sodium Bicarbonate
First don't write NH5CO3, as if the five H atoms were similar. No ! You should write NH4HCO3. This s ...
6-2-2021 at 03:41
by: Maurice VD 37
Low(est) boiling point salts?
Silicon tetrachloride boils at 57°C. Silicon tetra bromide boils at 153°C.
Tin tetrachloride boil ...
2-2-2021 at 13:59
by: Maurice VD 37
Copper (I) carbonate
Seems to be impossible. Copper(I) chloride is not soluble into water !!! How can you mix its solutio ...
2-2-2021 at 13:43
by: Maurice VD 37
How to calcine aluminum but not copper.
@ Pneumatician.
The verb "to calcine" comes from the latin : calcis, the chalk.
It has two meaning ...
16-1-2021 at 13:07
by: Maurice VD 37
How to calcine aluminum but not copper.
What do you mean with "to calcine Al" ? Do you want to evaporate a solution of an aluminum salt ? Do ...
13-1-2021 at 12:47
by: Maurice VD 37
Oxalate Stain Removal from Stainless Steel Question
If I summarize your observations, you started by trying to remove red iron stains from stainless ste ...
8-1-2021 at 13:24
by: Maurice VD 37
Is it normal to get low yields all the time, or am I a bad organic chemist?
I have the tendency to think that Vogel's book reports exaggerated yields. Personally I have always ...
26-12-2020 at 09:02
by: Maurice VD 37
yellow calcium hydroxide + ammonium nitrate
The yellow color is probably some iron impurity present in the chalk. CaO and Ca(OH)2 are usually ma ...
18-12-2020 at 12:58
by: Maurice VD 37
How to Separate NaOH Impurities? (NaI, Sodium Iodide)
If you heat the mixture NaI + NaIO3 at 500°C, NaIO3 will be transformed into NaI, but any amount of ...
14-12-2020 at 02:00
by: Maurice VD 37
How to Separate NaOH Impurities? (NaI, Sodium Iodide)
Try to add ammonium chloride NH4Cl. If there is NaOH in your salt, it will produce NaCl and NH3 whic ...
12-12-2020 at 04:49
by: Maurice VD 37
Gunpowder (Potassium Chlorate) from Bleach
I would be cautious about the competence of the experimenter. He says that NaOCl can be read "N H O ...
4-12-2020 at 08:28
by: Maurice VD 37
Elemental iodine from KI and bisulfate - results
The chemical equation is :

4 NaHSO4 + 4 KI --> Na2SO3 + K2SO3 + Na2SO4 + K2SO4 + 2 I2 + 2 H2O
...
3-12-2020 at 14:12
by: Maurice VD 37
Chloroform without bleach
Use bleaching powder instead of bleach. Bleaching powder is made of calcium hypochlorite Ca(ClO)2, w ...
1-12-2020 at 12:58
by: Maurice VD 37
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