Abchirk

(BTW, a lot of the column manufacturers supply "application notes" for their columns. It's blatant advertising, but it's a good way to find out about analytical methods, on-line, for free.)

Yes, I know I was a bit in hurry...

But I asked my teacher now and he said that I could do it with pH=2 also on the column, but I have to re-neutralize the column every day...

Thanks for your help!

Yeah and then maybe titration, but we have to use modern analytic methods like HPLC etc.

I found some papers...

Does anyone has free access to papers like this:

- quantifying via GC - it would be very appreciated.

I already got this one:

- quantifying via HPLC -, but I guess our HPLC doesn't have such column.

Merged post follows:

hm well, I got all papers now...

I have decided to use HPLC with a gradient (oH-level ~2)

Because you need something which prevents the ascorbic acid of degrading to dehydroascorbic acid. You can achieve this with substances which block the oxidizing of Ascorbicacid or a acid like metaphyophoric acid which also safes the ascorbic acid.

Hey I have searched in the internet, but I didn't find anything related to that. I found how to extract the hot substances like gingerol.

But I didn't find anything for ascorbic acid. So does anyone has an idea? I want to quantify the amount of vitamin C in ginger. It is for a project work at school.

Any suggestion is welcome!

google "thermite"

interesting, thank you. I saw it in the first post too now,

hi cool video, what was the last thing.

Al + FeO? I just understood something with very hot iron...

Or could someone clarify this for me, the reaction and it's reactants?

thx

Could it be, that this is working, because the mixture takes the water out of the fat...? And it'll really look thinner. But as longer as you may try it and stop from one day to another, your body reminds that there was a high need of water and maybe you get much more fat on the area where you put this mixture, because your body still supplies the water.

just an idea.

But better do sports and eat some fibres.

it's workin again!

Does this also affects IRC? I tried blackcobalt and opressess.us, but no answer?

cheers

Does this also effects the ircserver? I tried blackcobaldt and opressess.. no connection?

cheers

Hi

Does anyone know, if there is a database( would be good in sql-schema or in a schema which is easy to convert to sql), which is free for download. Just for basic compounds and their molweight, boiling point, etc?

Theo.. its your turn!

@ alien..

there is a xchat version which hasn't a 30day trial -> -Xchat free version -, maybe you update your post.

oh ya..... I tried to choose a simple one, but maybe that was the mistake, I know that there were more then one possible answer...

anyways formic acid is correct!

Sorry alien, I was very tired when I posted this...

next one, this element sounds like it steals the letter L

but I really don't know.

yeah right! But you should give the next compound...

nevermind here is the next and who guess this right has to give the next...

H2SO4:

----------

You can find this quite weak acid in very small animals which have a big own state with a queen... they are known as to work in a group and they can carry a multiple of their own weight. So which acid is it!?

hey guys, may you're interested in such thread...

I'll start and who gives the right answer has to ask next question!

allowed are all chemical compounds which have been confirmed.

............

here is a simple one:

it consists of an element in the 6 main group and two other elements, you shouldn't drink that, also it is very often used in syntheses. One of the other elements is very light and the second other element is necessary in combustions

?

Ya, I heard of Ullman's, but thats quite to expensive for me >1000$ and more

I'll try to find something from the engineers book.

If its table data... it should be possible to write a simple app, which makes charts from the data?

Hi guys,

I hope you can help me...

I search for "Temperature versus mole fraction for high and low boiling azeotropes - charts"

e.g. like those for azeotropes:

Maybe for chloroform / water... I found only charts which just showing raw curves...

Is there any option to get real charts for that?

If you didn't understand what I wanted to say, here is a link to phase diagrams and if you scroll down, for azeotropes, for what I search.

http://www.uiowa.edu/~c004131a/LVSolution%20Phase_Diagrams.html

thx in advance.

Pure H2O is hardly conductive. Tap water contains trace minerals and elements which allow the water to be conductive. However electrolysis of tap water can create many different gases including hydrogen itself.

hm, yes ok.

But I meant pure H2O, so demineralised water!

regarding to this topic:

http://www.scienceforums.net/forum/showthread.php?t=40900

Why not over electrolysis of water? Isn't it enough hydrogen...?

I didn't want to split the other topic.. so thats why I am asking here!

Hi all!

I am searching for a traineeship in chemistry in an English-speaking country or in a lab where english is the main language.

I am actually in the 2nd year of a trainee for a chemistry assistant. I did simple syntheses and some analytical stuff, also other things.

Any ideas where I could apply? Or if there are any institutions which can handle such requests, because I need also a place where to sleep then.

greetings