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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.
Katamtaman
1 day
Mga Tagubilin
1
1
Phosphorus under hot water
Phosphorus under hot water
Cover 1 oz of amorphous (red) phosphorus with 30 oz of hot water.
Mga kailangang kasangkapan:
Pulang posporo
Tubig
Basong Salamin na Pang-agham2
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.
Mga materyales para sa hakbang na ito:
Yodo13.5 ozMga kailangang kasangkapan:
Batong Almires at Panghalo3
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.
Mga materyales para sa hakbang na ito:
Apog na hindi pa napapatay8 ozMga kailangang kasangkapan:
Tubig
Basong Salamin na Pang-agham4
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.
Mga kailangang kasangkapan:
Telang muslin
Tubig5
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.
Mga kailangang kasangkapan:
Platong Pansingaw
Krisol na may takip (porselana)Mga Kinakailangang Kasangkapan
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