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Recrystallisation question - help me design an experiment for junior students
Is it not possible to use any salt, like potassium nitrate ? The idea is to dissolve it in hot water ... |
5-1-2024 at 11:34
by: Maurice VD 37 |
Relative number of moles
I repeat my reasoning with another example : blood instead of sea water. What is the relative amount ... |
5-1-2024 at 09:47
by: Maurice VD 37 |
Easy way to make phosphorus pentachloride with easy to get reagents
What is the question ? |
5-1-2024 at 09:26
by: Maurice VD 37 |
Glyoxylic acid synthesis - starting w/ oxalic :: w/o PbO2
Why do you want an alternative ? The usual way for making PbO2 is to take a lead electrode, and use ... |
30-12-2023 at 07:55
by: Maurice VD 37 |
Why does my Mg-Cu galvanic cell produce the wrong voltage?
This problem has puzzled me for years. How was the standard potential for Mg measured ?
It seems ... |
26-12-2023 at 09:38
by: Maurice VD 37 |
Preparation of silica sulphuric acid
Explain us what exactly you have done, and observed. And what you should have observed. What is this ... |
26-12-2023 at 08:12
by: Maurice VD 37 |
Titanium dioxide
Why did you buy a product that was known to be nearly useless ? What for ? |
18-12-2023 at 01:17
by: Maurice VD 37 |
Fake Terbium?
Why don't you first weigh a bit and dissolve it in HCl, then evaporate the solution. Or precipitate ... |
11-12-2023 at 02:41
by: Maurice VD 37 |
Puriying Sodium Silicate
Solution of sodium silicate are always hydrolyzed. If by chance some sodium silicate is supposed to ... |
1-12-2023 at 08:03
by: Maurice VD 37 |
Carbonates/ hydroxides from carbonates?
RU KLO's first question was about the reaction of Cr^3+ and carbonate. He wanted to know why it prod ... |
1-12-2023 at 07:57
by: Maurice VD 37 |
Relative number of moles
Let's take an example.
1 liter sea water contains 29 g NaCl 0r 29/(23 + 35.5) = 0.49 mol NaCl.
1 ... |
1-12-2023 at 07:31
by: Maurice VD 37 |
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 |
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