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Sodium Pyrophosphate: Disodium Phosphate Heated to 300 °C
Sodium pyrophosphate is a white salt that dissolves to an alkaline solution. Thorpe's Dictionary (1913) makes it in two easy stages: neutralise phosphoric acid with soda until alkaline and crystallise disodium phosphate, then heat the dried salt to 300 °C, when it gives off water and turns into the pyrophosphate.
The picture: our diagram.
初学者
1 day
说明
1
1
Phosphoric acid and soda
Phosphoric acid and soda
Add sodium carbonate to phosphoric acid diluted with water until the solution is alkaline. Filter.
此步骤所需材料:
磷酸(85 %)1 个
碳酸钠(纯碱)1 个所需工具:
蒸馏水
pH 指示剂试纸
耐热玻璃烧杯
带颈玻璃漏斗
滤纸
化学防溅护目镜
橡胶手套2
2
Crystallise disodium phosphate
Crystallise disodium phosphate
Concentrate and let it crystallise: large clear prisms of disodium phosphate. Dry them at about 45 °C until they lose their water.
所需工具:
蒸发皿
电热板3
3
Heat to 300 °C
Heat to 300 °C
Heat the dry salt to 300 °C: it gives off water and turns completely into sodium pyrophosphate, a white glassy mass.
所需工具:
坩埚
马弗炉
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