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Mysterious bottle
Is not this just overcomplicated bottle for pouring liquids?
Upper test tube like thing is stopp ... |
11-10-2006 at 06:42
by: chromium |
ethyl acetate
[quote][i]Originally posted by Tacho[/i]
It's almost harmless healthwise (if someone knows better, ... |
11-10-2006 at 00:21
by: chromium |
Production of Copper Sulfate by Electrolysis
Do not use ion bridge this just cuts current and is not needed for making CuSO4. Aluminium cathode s ... |
1-10-2006 at 22:53
by: chromium |
I'm about to take the plunge and incorporate...
[quote][i]Originally posted by not_important[/i]
The problem with sales and supply companies is tha ... |
28-9-2006 at 03:35
by: chromium |
Plating out Chromium metal
Classic way:
250 g/l CrO3 (can be made from dichromates),
1.25 ... 2.5 g/l H2SO4
temperature 4 ... |
27-9-2006 at 09:20
by: chromium |
Salting out
Russian "Spravatshnik himika" Tom II has some data about equilibrum in ethanol-water-salt mixtures a ... |
22-9-2006 at 03:56
by: chromium |
Salting out
[quote][i]Originally posted by matei[/i]
"Salting out" with NaCl is used when you want to decrease ... |
21-9-2006 at 11:05
by: chromium |
Salting out
IIRC potassium carbonate is most efective. It separates water almost completely. |
21-9-2006 at 01:19
by: chromium |
Chemical resistance of materials
You probably can not trust any resistance charts. As we have seen here, even best chemistry handbook ... |
18-9-2006 at 10:22
by: chromium |
Sodium hydroxide from baking soda
Sodium carbonate does not decompose by heating. (at least if temperature is less than 1000C)
Prep ... |
18-9-2006 at 08:42
by: chromium |
solubility of NaI
NaI 30.0 g in 100g acetone @ 20C. No exact data about potassium iodide but it is much less soluble. ... |
13-9-2006 at 06:29
by: chromium |
Even element samples are banned from eBay
I do not know how it is in USA but in my country firms do not worry about every kind of lost markets ... |
4-9-2006 at 03:43
by: chromium |
Propane/Acetylene torches
Do not know for sure but i suppose that acetylene does not make much difference. Oxygen is needed fo ... |
3-9-2006 at 12:40
by: chromium |
organic chemistry glassware
[quote][i]Originally posted by rogue chemist[/i]
There are some really good prices on that Hofman s ... |
28-8-2006 at 09:38
by: chromium |
Some errors
It should not be very hard to make php or python script that automatically converts all too big imag ... |
27-8-2006 at 13:59
by: chromium |
Sodium!
Most computer PSU-s (no matter ATX or older) switch outputs immediately off when overcurrent occurs. ... |
23-8-2006 at 22:35
by: chromium |
Storing sodium
IIRC xylene can be used to store sodium.
Edit: Do not know about petroleum ether but problem with ... |
20-8-2006 at 13:42
by: chromium |
AC power supply for experiments
[quote][i]Originally posted by 12AX7[/i]
Output power is NOT in amperes. Power is watts (V*I (real ... |
7-8-2006 at 16:16
by: chromium |
AC power supply for experiments
I measured current and voltage in both ends. Computed respective power by P = I * U and efficiency b ... |
7-8-2006 at 15:25
by: chromium |
AC power supply for experiments
Thanks, your replies are very useful.
I did some experiments with LMD18201 H-bridge. Bridge was ... |
7-8-2006 at 12:26
by: chromium |
Phenol from Paractemol (Acetominophen)
Smell of phenol is very strong and quite different. Some printed circuit boards have slight phenolic ... |
4-8-2006 at 13:16
by: chromium |
Suspicious company
Looks like there should be some special chemistry books for special agents which tell that only chem ... |
4-8-2006 at 07:09
by: chromium |
AC power supply for experiments
Ok, thanks so far but i still do not get answers to my questions. I try to explain once more what ex ... |
3-8-2006 at 15:58
by: chromium |
AC power supply for experiments
[quote][i]Originally posted by 12AX7[/i]
So, what do you want? A 12VDC to 120VAC inverter? Get an ... |
3-8-2006 at 14:08
by: chromium |
AC power supply for experiments
Efficient electrolysis, electric arcs, glowing graphite rods, induction heating - quite a lot can be ... |
3-8-2006 at 13:08
by: chromium |
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