Sodium potassium tris(oxalato) ferrate

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.

Sodium aluminium sulfate

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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Sodium Citrate

Formula: Na₃C₆H₅O₇·2H₂O

Sodium salt of citric acid, product of neutralization of citric acid with baking soda.

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Glucose Sodium Bromide

Formula: 2C₆H₁₂O₆·NaBr·H₂O

Crystalline adduct (cocrystal) of carbohydrate glucose with sodium bromide.

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Sodium tris(oxalato) aluminate

Formula: Na₃[Al(C₂O₄)₃]·5H₂O

Also known as sodium alumooxalate or sodium oxalatoaluminate. Similar compounds:

Potassium analog that have different structure: potassium tris(oxalato) aluminate.
Iron analog, with the same structure and nice green color: sodium tris(oxalato) ferrate(III).

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Sodium tris(oxalato) ferrate (III)

Formula: Na₃[Fe(C₂O₄)₃]·3H₂O Other names are: sodium oxalatoferrate and sodium ferrioxalate.

Product of dissolving rust in oxalic acid (H₂C₂O₄) in presence of sodium oxalate. Surprisingly for an iron (III) compound, has bright green color. A well-known example of coordination complex.

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Sodium saccharin

Formula: C₇H₄NNaO₃S·?H₂O

Saccharin is the first successful chemical sugar substitute; it gained its popularity during the time of WWII and is still in use nowadays, though to a much lesser extent: there are tastier and safer substitutes now. Strictly speaking, saccharin is a weak acid, that is almost insoluble in water. Soluble saccharin is its sodium salt: sodium saccharinate.

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