You may want to check my post at: https://www.researchgate.net/post/How_to_calculate_solubility_of_hydrated_inorganic_salts

This paper addresses hydrates of tin tetrachloride:

http://journals.iucr.org/c/issues/2004/04/00/gd1307/index.html

Thank you dear Carlos Araújo Queiroz.

First of all let me say that pure SnCl4 is not a powder but a clear liquid which fumes in contact with moist air. With small amounts of water, the solid crystalline pentahydrate SnCl4.5H2O is formed. This is soluble, but with more water hydrolysis can occur.