I have a solid sample of H2PtCl6.xH2O. It is known that this compound is highly hygroscopic and difficult to handle during weighing so i want to dissolve the whole sample in a known volume to store it for further use.
You can keep the sample in a desiccator with Magnesium Perchlorate. You can can also weigh sample in controlled laboratory condition and can prepare solution in presence of 10% Hydrochloric Acid.
Desiccators are usually sealed so that outside air cannot enter the chamber. In some cases, dessicators may also be fitted with a vacuum hose in order to remove excess air from the inside of the chamber. Mostly moisture removal from the desiccator CaCl2 and Silicagel. hexachloroplatinic acid are stored in decicator.
The speciation of platinum will gradually change with time in a diluted H2PtCl6 solution (see the work of Belskaya et al. Chemistry for Sustainable Development 19 (2011) 3343) by exchange of Cl- by OH- and OH2. This exchange is faster when the solution is exposed to light. If you want to store a diluted H2PtCl6 solution, you can try to store it in a refrigerator and protect it from light (and check whether the platinum speciation has changed using UV-visible spectroscopy). For concentrated solutions, they are far more stable (due to the low pH) and you can buy 8wt% H2PtCl6 solution : http://www.sigmaaldrich.com/catalog/product/aldrich/262587?lang=fr®ion=FR
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