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Calcium Iodide: Iodine Dissolved over Amorphous Phosphorus and Neutralised with Milk of Lime (Liebig, Thorpe 1912)
Iodine stirred into hot water over red phosphorus turns into hydriodic acid. Milk of lime turns that acid into calcium iodide, and the phosphorus leaves as an insoluble sludge.
Result: a solution of calcium iodide; boiled down, deliquescent needles; fused dry in a closed vessel, the anhydrous salt.
Source: Thorpe, Dictionary of Applied Chemistry vol. 1 (1912), p. 604, after Liebig (Annalen 121, 222). Not given: water for the milk of lime. Picture drawn by Youblob.
Intermediate
1 day
Instructions
1
1
Phosphorus under hot water
Phosphorus under hot water
Cover 1 oz of amorphous (red) phosphorus with 30 oz of hot water.
Tools needed:
Red Phosphorus
Water
Glass Beaker2
2
Stir in the iodine
Stir in the iodine
Add finely powdered iodine little by little, stirring all the time, as long as it dissolves without colour. About 13½ oz dissolves.
Materials for this step:
Iodine13.5 ozTools needed:
Stone Mortar and Pestle3
3
Neutralise with milk of lime
Neutralise with milk of lime
Pour the colourless liquid off the small deposit. Make it slightly alkaline with milk of lime; about 8 oz of lime is needed.
Materials for this step:
Quicklime8 ozTools needed:
WaterGlass Beaker4
4
Strain and wash
Strain and wash
Strain the solution and wash the residue of calcium phosphate, phosphite and hydroxide. The solution holds the calcium iodide. Ours: strain through muslin.
Tools needed:
Muslin ClothWater5
5
Evaporate, then fuse dry
Evaporate, then fuse dry
Evaporate to get the hydrate in deliquescent needles. For the dry salt, evaporate and fuse the residue in a closed vessel; in air it gives off iodine and turns to lime.
Tools needed:
Evaporating Dish
Crucible with Lid (Porcelain)Tools Required
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