Exact formula of tetra-amine-zinc complex

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The exact formula of the tetra-amine-zinc complex is confirmed to be [Zn(NH3)4]2+. When ammonia is introduced to hexaaquazinc ions, it initially forms zinc hydroxide, [Zn(H2O)4(OH)2]. In the presence of excess ammonia, this precipitate redissolves into the tetraamine complex. The tetrahedral geometry of the complex is established, and the presence of water ligands is ruled out in this specific formulation.

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hyurnat4
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Sorry this post doesn't look beautifulized and pretty; its 23.00 here.

When ammonia is added to hexaaquazinc ions, the NH3 acts as a base and forms [Zn(H2O)4(OH)2], better known as Zinc hydroxide. However, in excess NH3, the ppt will redissolve as a tetraaminezinc complex. My question is: is the precise formula [Zn(NH3)4]2+ or [Zn(NH3)4(H2O)2]2+?
Trivial, I know, but I cannot rest until this itch is scratched. Logic would suggest the latter, but a lot of sites seem to quote the former. If there are no stray water ligands, what is the reason for this?

Thanks in advance.:bugeye:

Edit: Grr... Hate these constantly reappearing templates.
 
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It’s [Zn(NH3)4]2+. The complex is tetrahedral.
 

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