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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.
Beginner
1 day
Instructions
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.
Materials for this step:
Phosphoric Acid (85%)1 piece
Sodium Carbonate (soda ash)1 pieceTools needed:
Distilled Water
pH Indicator Paper
Heat-Resistant Glass Beaker
Glass Funnel - Stemmed
Filter Paper
Chemical Splash Goggles
Rubber Gloves2
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.
Tools needed:
Evaporating Dish
Hot Plate3
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.
Tools needed:
Crucible
Muffle Furnace
Heat-Resistant GlovesMaterials
2- 1 piecePlaceholder
- 1 piecePlaceholder
Tools Required
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