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Trisodium Phosphate: Phosphoric Acid, Soda, then Caustic Soda
Trisodium phosphate is the strongly alkaline sodium phosphate used to throw down cobalt violet. Thorpe (1913): soda added to phosphoric acid until alkaline gives disodium phosphate; excess caustic soda turns that into the trisodium salt, which crystallises in six-sided prisms. Caustic soda burns skin: gloves and goggles.
The picture: trisodium phosphate (Wikimedia Commons).
初学者
1 day
说明
1
1
Phosphoric acid and soda
Phosphoric acid and soda
Goggles and gloves on. Dilute 100 g of 85 % phosphoric acid with water and stir in soda ash until the liquid is alkaline to litmus (about 92 g). Filter.
此步骤所需材料:
磷酸(85 %)100 克
碳酸钠(纯碱)92 克所需工具:
水
硼硅玻璃烧杯
玻璃搅拌棒
石蕊试纸
细棉滤布
等臂天平
化学防溅护目镜
橡胶手套2
2
Add caustic soda
Add caustic soda
Dissolve about 40 g of caustic soda in a little water and add it to the disodium phosphate solution: a little more than the 35 g the equation needs.
此步骤所需材料:
烧碱(氢氧化钠)40 克所需工具:
水
硼硅玻璃烧杯
玻璃搅拌棒
橡胶手套
化学防溅护目镜3
3
Crystallise
Crystallise
Concentrate and let it crystallise; the free alkali stays in the mother liquor. Drain the six-sided prisms and keep them in a closed jar.
所需工具:
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砂浴
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