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DRIFTS
There are really two concepts here.
Diffuse reflectance AND
Fourier transform IR.
Can't re ... |
29-11-2005 at 04:29
by: Quibbler |
Home made spectrometer
I'm sure you meant LOG(transmission) against conc. - absorbance is already logged. OK it is an ... |
29-11-2005 at 04:17
by: Quibbler |
Home made spectrometer
I made a mistake too only a factor of two though. My half height widths should be 26 nm (not 13 nm). ... |
28-11-2005 at 05:33
by: Quibbler |
Home made spectrometer
I've had a look at the spectrum of some LEDs. It is possible to get a bit of tuning by putting ... |
25-11-2005 at 11:18
by: Quibbler |
Chemistry Homework Help
I think it is done at 298 K these days so 1 mole (ideal gas) occupies 0.0248 m3. There's even s ... |
23-11-2005 at 08:34
by: Quibbler |
Chemistry Homework Help
Just a thought how do you weigh 7.8 g of oxygen. Typical chem teacher not a real problem just made u ... |
23-11-2005 at 04:08
by: Quibbler |
Home made spectrometer
Marvin is quite right most UV/Vis spectra are amazingly dull. Most measurements are to determine the ... |
23-11-2005 at 04:03
by: Quibbler |
Home made spectrometer
Search for LED color chart. It would seem you can cover the whole range with reasonable resolution.
... |
22-11-2005 at 10:20
by: Quibbler |
Synthesis of Gold
I'm pretty sure (but correct me if i'm wrong) that elements beyond 56Fe can be formed by f ... |
20-10-2005 at 03:52
by: Quibbler |
Electromagnetic/magnetic screens materials?
IMHO there is nothing better than ferrite. Like the other materials it concentrates the magnetic fie ... |
14-10-2005 at 04:28
by: Quibbler |
Anyone Knows Analytical Chemistry?
Well pH is really -log(activity H+).
activity H+ = conc x activity coefficient
at a conc of 1M (HC ... |
14-10-2005 at 04:13
by: Quibbler |
Anyone Knows Analytical Chemistry?
If you want to make approximations you can dispense with the quadratic
[H+][OH-] = 10^-14 (before) ... |
12-10-2005 at 09:56
by: Quibbler |
Anyone Knows Analytical Chemistry?
Oh no I've forgot how to use logs.
log (10^-7+10^-8) = 7 - log(1.1)
or approx 7 - (0.1/2.3) = ... |
12-10-2005 at 07:58
by: Quibbler |
2 questions
I think there is a subtle difference between Pt½ and ½H2 because you can get half a H2 but not hal ... |
12-10-2005 at 04:24
by: Quibbler |
Anyone Knows Analytical Chemistry?
I've tried to resist adding to this academic debate. But here goes
adding 10-8 HCl (if nothing ... |
12-10-2005 at 04:02
by: Quibbler |
NMR predictor?
I wrote a program in basic some time ago that I have to say I am quite proud of. It calculates proto ... |
28-9-2005 at 04:19
by: Quibbler |
Quartz Tubing
It is difficult to add anything to the excellent replies above, but I must emphasise the eye protect ... |
23-9-2005 at 04:09
by: Quibbler |
Catechol colours with carbonate
Yes I see what causes the colours the quinone type structure. What I am trying to find out is:
Star ... |
14-9-2005 at 12:08
by: Quibbler |
Catechol colours with carbonate
I've tried it again and its a bit difficult to reproduce, but on about my 30th attempt I got a ... |
14-9-2005 at 11:19
by: Quibbler |
Catechol colours with carbonate
Some time ago I mixed a catechol (1,2-dihydoxybenzene) solution with potassium carbonate (can't ... |
13-9-2005 at 09:17
by: Quibbler |
the affect of electric field on electrolytes
Quite right the field stength would have to be very large. If however you put in other ions at the r ... |
13-9-2005 at 09:10
by: Quibbler |
Thiols (mercaptanes) preparation?
Forget it!
Mercaptans don't just smell they stink. They cling, you will smell of them for d ... |
9-9-2005 at 04:10
by: Quibbler |
Separation of NaCl and KCl
Yeah but if I sprinkle it on my food and eat it, the potassium will come into VERY close contact wit ... |
2-9-2005 at 06:43
by: Quibbler |
Separation of NaCl and KCl
Just thought I would throw this one in:
KCl is radioactive
NaCl is not |
2-9-2005 at 04:48
by: Quibbler |
physical chemistry questions!!!!
I think this may be a circular argument. In order to get rid of the Lagrange multiplier beta (B) the ... |
1-8-2005 at 04:33
by: Quibbler |
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