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2H3PO4 + 2NaOH = Na2H2P2O7 + 3H2O
2H3PO4 + Na2CO3 = Na2H2P2O7 + CO2 + 2H2O
Sodium Acid Pyrophosphate also known as Di-sodium Di-phosphate is an inorganic compound of sodium and pyrophosphate. It is white and soluble in water. SAPP is manufactured with double drying process like other Pyrophosphates due to heating needed at a high temperature.
| Product Name | Sodium Acid Pyrophosphate (SAPP) Anhydrous |
| IUPAC Name | Di-sodium di-hydrogen di-phosphate |
| Molecular Formula | Na2H2P2O7 |
| Molecular Weight | 222.00 |
| Molecular Structure |  |
| Appearance | White fine Powder |
| PH Range (1% w/v) | 3.5 – 4.5 |
| Pyro % (minimum) | 98.00 |
| P2O5 content % (minimum) | 62.00 |
| ‘Na’ Content % (minimum) | 20.00 |
| Iron as ‘Fe’ content % | 0.02 |
| Chloride as ‘Cl’ content % | 0.2 |
| Sulfate as ‘SO4’ content % | 0.03 |
| Packing | 20 Kg, 25 Kg, 40 Kg, 50 Kg, HDPE Bags / Drums. Or As per customer’s request |