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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.
中级
5 weeks
说明
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.
此步骤所需材料：
脱脂奶10 parts
乳糖2.5 parts
碳酸钙（白垩粉）2 parts
水20 parts所需工具：
等臂天平
玻璃器皿2
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.
所需工具：
玻璃器皿
实验室温度计3
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.
所需工具：
干酪布
滤纸
蒸发皿
电热板4
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.
此步骤所需材料：
二水合草酸1 as required所需工具：
玻璃器皿
未知后处理
化学防溅护目镜
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