[NewCandle] crystallization weight change transients

[Nick Reiter]

Hi Keith,

Red Devil is indeed up there on the ones that comes to
mind immediately - and yes, it is my experience (as
well as understanding) that what evolves heat on
solution would absorb it on crystallization.

I was reading about simple binary ionic salts today -
it seems they are typically pretty hard to get into a
supersaturated state.  NaCl apparently has nearly the
same solubility at 100C as it does at 20C.  Not sure
about hydroxides like lye.

I was also thinking sucrose sugar this afternoon.  Now
that would put a chiral twist on the whole matter, eh?

The three parts  hypo-S to 1 part water was how I ran
the first hypo-S run.  Thats what gave me only 2
milligrams of weight loss.  It is far below maximum
solubility though... yesterday, when I was getting the
4 mg type deflections, I was more like 5 to 6 parts
hypo-S to water.  UNLESS way back in the day they were
going with an anhydrous version... the natural
hydrated version is a pentahydrate.  If they were
using anhydrous, 3 to 1 might just about work out to
where I was at by trial and error at maximum.

N

--- Keith Nagel <NewCandleAdmin at ipdiscover.com> wrote:

> Fair enough on the hot air thing.
> 
> As concerns the endothermic crystallization,
> wouldn't
> it be the case that salts that are exothermic on
> dissolution would be endothermic on crystallization?
> The devil we know, comes to mind, although that
> would
> be rather bothersome to work with. How about
> ordinary
> table salt?
> 
> Here's another question. The reference Colin
> provided
> describes a solution of 3 parts by weight of the
> salt
> to one part water. How close are you now to this
> ratio?
> 
> K.
> 


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