solubility determination

[m777182]

Has anybody experience with the determination of solubility in water, room temperature, of an inorganic salt that rapidly decays in a solution?
m777182

 

[c2sco]

Interesting one!

Can you do it a couple of times at as low a temperature as possible, and extrapolate the results?

Or add something to stabilise it that's much more soluble than the material under scrutiny?

Tongue in cheek for a lunchtime diversion - look up Isaac Asimov's story, called something like "The endocrinic properties of (some long organic compound name)" in which he described a material that dissolved before it touched the solvent and hence led the way to time travel!! He wrote it during his Doctorate and told the publisher not to publish before his viva in case it prejudiced his degree. Alas the publisher failed to follow his instruction and the interviewer had read the story - but took it in good spirit.

 

[m777182]

I cannot go under 15deg C. Stabilizer is already there.It is a crystallization of an inorganic peroxide which we get by a reaction of two reactants and is salted out from nearly saturated NaCl (or Na2SO4)solution. I need the solubility as a function of concentrations of reactants and conc. of salt. The side reaction is H2O2 decay.The problem as I see it is that I cannot come to some equilibrium, the ratio of components is changing fluently. Any idea?
PS: Asimov wrote whatever crossed his mind, the more bizzar, the better.Nice fellow. But sometimes it really happens that a cause comes after the consequence -I can proove it from our sales data that soon after an increase of sales of one of our products(outdoor paints) a period of nice weather follows...
m777182

 

[nbucska]

The thiotimoline had practical application -- at least in the story. Has your problem ?

<nbucska@pcperipherals.com>

 

[m777182]

Hello nbucska,
regretfully I do not know anything about thiotimolin.Could you give me a hint?
m777182

 

[c2sco]

Thiotimolin was Asimov's ficticious substance.

Your aim is a bit unclear, but could you:
- decompose the dissolved mother liquor and back calculate from this to what was in solution?
- look at yield of product material as a function of NaCl concentration?
- measure the time-changing concentrations and model the system?

 

[25362]

I haven't the faint idea of what the inorganic salt is, however when speaking of hydrogen peroxide one must consider that the weakly acidic H₂O₂ adds water on decaying, thus changing the reactant concentrations.

Besides, H₂O₂ is quite versatile and can react by molecular additions, substitutions, oxidations and reductions directly as is or by ionizing or dissociating into free radicals.

More often than not these reactions are quite complex and may be catalyzed or otherwise influenced by the environment.