Blogfast25:
Upon further research, before seeing your comment, I removed the possible formations of the SnCl2.NH3 and SnCl2.2NH3 abducts as these may be created
only by the anhydrous SnCl2 reacting with ammonia gas. Although I would not be surprised if these abducts, upon being created, were capable of
forming hydrates (in a similar fashion to CaCl2).
However, per the reactions, for example:
6 SnCl2 + 2 H2O + O2 --> 2 SnCl4 + 4 Sn(OH)Cl (s)
SnCl2 + 2 NH3 + 2 H2O --> Sn(OH)2 + 2 NH4Cl
SnCl4 + 2 NH4Cl --> (NH4)2SnCl6 (Ammonium chlorostannate or pink salt)
any resulting formation of (NH4)2SnCl4 or even (NH4)2SnCl6, could reduce your yield of SnO2.
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