Is there a specific reason why NaF should be stored above 0 degrees. Are there any research papers out there suggesting a reason?
Dear Tom Dennis
I just come across your old question.
Hope still worth to answer it.
NaF is soluble in water (about 49 mg/ml). However, it is necessary to heat the sample to reach the saturation limit as a stable solution, yielding a clear and colorless solution.
The pH of a freshly prepared saturated solution of NaF is about 7.4, slightly changed by the self protolisys of the water at low temperatures.
If stored down below zero Celsius, you may face solubility issues; in general, the solution will decrease in concentration by crystallizing in tiny particle size crystals, not always visible, changing the mass/volume ratio.
To be restored, it needs to be heated up, at the cost of loose solvent and finishing with different final concentration.
Best regards
WNM
Dear Wagner Da Nova Mussel
Thank you for your answer. I did store my NaF solution above 0C as I came across the “desaltination” effect when frozen.
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