Tag: potassium

Sodium potassium tris(oxalato) ferrate

Formula: K5Na[Fe(C2O4)3]2

Sodium potassium tris-oxalato ferrate

One of the most interesting crystals: a double salt of sodium, potassium and ferrioxalate ion that have deep green color, highly symmetric shape and great stability upon exposure to air. Unfortunately, I was not able to prepare aluminium analog: Na and K alumooxalates just crystallized separtely.

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Potassium Zinc Sulfate

Formula: K2Zn(SO4)2·6H2O Potassium Zinc Sulfate

Potassium twin of ammonium zinc sulfate, visually indistinguishable from it. I suspect that precise measurement could reveal some subtle differences in angles between faces, but for the naked eye these compounds look the same. Similarly, baking soda can be used to improve crystal quality (see "Growing" section).

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