Tag: double salt

Formula: K₅Na[Fe(C₂O₄)₃]₂

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.

See also:

• Potassium tris(oxalato) ferrate (III): pure K salt
• Sodium tris(oxalato) ferrate (III): pure Na salt
• Sodium tris(oxalato) aluminate: Al analog

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Formula: NaAl(SO₄)₂·12H₂O

Also known as sodium alum, this double sulfate is among the most elusive alums species. Typycally, alums have comparatively low solubility and crystallize easily, but for sodium aluminium sulfate it is not the case.

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Formula: (NH₄)₂Fe(SO₄)₂·6H₂O

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Formula: KLiSO₄

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Formula: KNaC₄H₄O₆·4H₂O

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Ammonium Iron (III) sulfate, formula: NH₄Fe(SO₄)₂·12H₂O

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