PyroRA - 29-6-2008 at 06:47
I found a bag, just the mix, for growing crystals, I don`t know what I am supposed to do with it to actually grow the crystals, it says its made of
alu potassium sulfate and dye, how do I turn this into crystals? never done this before,
ScienceSquirrel - 29-6-2008 at 10:08
There are plenty of instructions on the Internet.
Here is an example, you can find plenty more if you just Google 'alum crystal'.
http://chemistry.about.com/cs/howtos/ht/alumcrystal.htm
And try not to be so hopeless in future if you keep on asking easily answered questions people will start to ignore you.
PyroRA - 29-6-2008 at 10:16
no wait my bad ALUMINIUM not alum
[Edited on 29-6-2008 by PyroRA]
oh, my bad again
[Edited on 29-6-2008 by PyroRA]
ScienceSquirrel - 29-6-2008 at 10:25
Aluminium potassium sulphate is alum.
http://en.wikipedia.org/wiki/Alum
JohnWW - 29-6-2008 at 15:40
The term "alum" is also applied to hydrous aluminium sulfate, Al2(SO4)3.18H2O, sold in bulk quantities as technical grade for flocculation in water
treatment. It is also applied to any double salt of the composition M(III)N(I)(XO4)2.12H2O, where M(III) is a trivalent cation which besides Al(III)
can be Ga, In, Tl(III), Fe(III), Co(III), Cr(III), V(III), Ti(III), and rare-earth cations; and N(I) is a univalent cation which besides K can be Na,
Rb, Cs, Ag(I), Tl(I), NH4, N(CH3)4, with mixed compositions also possible. X is usually S(VI) as sulfate, but also can be Se(VI) or Cr(VI).
ScienceSquirrel - 29-6-2008 at 17:03
I was talking about common alum.
Nice project for him though, he can make a series of alums.
They all crystallise in the same form and can be joint and over crystallised but the colours change on swopping out a cation.
Potassium chromium alum is purple
Ammonium chromium alum is bright green
If he can explain that he will get an A+ in his 'xams :-D