RogueRose - 28-9-2016 at 08:10
I had seen some sites where people made crystals with a solution of potassium and sodium chlorides. This made very large perfectly square crystals
that were clear. From what I remember it wasn't a 50/50 mix and may have been 60/40 KCl/NaCl - I'm not sure.
Molar Mass
74.55 KCl
58.44 NaCl
22.99 - Na
39.1 - K
35.45 - Cl
Mass of Na + K
22.99 + 39.1 = 62.09
For equal molarity these percentages are needed.
37.03% + 62.97% = 100%
But then I am worried about the solubility curve of KCl vs NaCl as at O Centegrage, KCl dissolves at 280g/L with a steady climb to ~560-580g/L @ 100
C. NaCl ranges from 35.9 to 38.3 from 0-100C. This is the major issue I am trying to figure out when trying to make a nice square crystal.
As far as I can tell, this would be the best way to make a 50/50 mix of salts as each has a different molecular weight. Does this sound like correct
line of thought?
[Edited on 28-9-2016 by RogueRose]
Dwarvensilver - 29-9-2016 at 12:46
Hi RogueRose,
I have not had time to try that one, thanks for the Idea
. So many chemicals so
little crystallizing time lol.
I tried NaCl and found this was somewhat disappointing so I would like clear square crystals as well so I will put it on my list.
Your idea of 50/50 mix sounds plausible to me, I have tried that with CuSO4 and NiSO4 which worked, also with NiSO4 and CoSO4 which gave me an
interesting dark black-green monoclinic beast so it can work.
Cheers,
Dwarven
Metacelsus - 29-9-2016 at 14:43
I don't think it's possible to make a true cocrystal of KCl and NaCl. The ionic radii are too dissimilar.