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Lactic Acid: Wackenroder's Calcium Lactate Split with Oxalic Acid (US Dispensatory 1907)
Wackenroder's lactic acid: skimmed milk, milk sugar, chalk and water kept warm for a month. As the acid forms, the chalk takes it up as calcium lactate. That salt is crystallised and then split with exactly enough oxalic acid to free the lactic acid; the lime falls as calcium oxalate.
Source: The Dispensatory of the United States of America (1907), Acidum Lacticum. Pharmacopoeial lactic acid, used as food-grade, as ruled. Unknown: how the free acid is separated afterwards; the Dispensatory does not say, so it is linked to an unknown head. The sulphuric-acid version is a separate blueprint. Picture drawn by Youblob.
Katamtaman
5 weeks
Mga Tagubilin
1
1
Mix 10 : 2.5 : 2 : 20
Mix 10 : 2.5 : 2 : 20
Mix 10 parts skimmed milk, 2.5 parts milk sugar, 2 parts chalk and 20 parts water. Ours: grams.
Mga materyales para sa hakbang na ito:
Gatas na inalisan ng krema10 parts
Asukal ng gatas2.5 parts
Calcium carbonate (puting tisa)2 parts
Tubig20 partsMga kailangang kasangkapan:
Timbangang panimbang
Sisidlang salamin2
2
Digest at about 24 °C for a month
Digest at about 24 °C for a month
Keep it at about 23.8 °C (75 °F) for a month, or until the chalk has dissolved.
Mga kailangang kasangkapan:
Sisidlang salamin
Termometrong Panlaboratoryo3
3
Press, clarify and crystallise the calcium lactate
Press, clarify and crystallise the calcium lactate
Press it out, clarify it, and evaporate it so the calcium lactate crystallises. Recrystallise it.
Mga kailangang kasangkapan:
Katsa (cheesecloth)
Papel na Pansala
Platong Pansingaw
Pang-init na Plato4
4
Split the salt with oxalic acid
Split the salt with oxalic acid
Decompose the calcium lactate with oxalic acid in exactly the saturating proportion. Oxalic acid is poisonous if swallowed: gloves. Unknown: how the lactic acid is then separated.
Mga materyales para sa hakbang na ito:
Asidong oksaliko dihidrato1 as requiredMga kailangang kasangkapan:
Sisidlang salamin
Hindi kilalang paghihiwalay
Salamin Laban sa Tilamsik ng Kemikal
Gwantes na NitrileMga Materyales
5- 10 partsPlaceholder
- 2.5 partsPlaceholder
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- 20 partsPlaceholder
- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
10- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
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