
Pyrophosphoric acid, MF: H₄O₇P₂, MW: 177.975, is a white crystalline powder or colorless viscous liquid. The pyrophosphate ion exhibits strong coordination properties. Excess P₂O₇⁴⁻ can dissolve insoluble pyrophosphates (e.g., Cu²⁺, Ag⁺, Zn²⁺, Mg²⁺, Ca²⁺, Sn²⁺) to form coordination ions such as [Cu(P₂O₇)₂] 6⁻, [Sn(P₂O₇)₂]⁶⁻, etc.
| Item | Specification |
| Melting point | 61 °C |
| Boiling point | N/A |
| Density | 2.4±0.1 g/cm³ |
| Acidity Constant (pKa) | 0.99±0.10 (Predicted) |
| Refractive Index | 1.560 |
| Flash Point | N/A |
| Solubility | Freely soluble in water (exothermic, gradually hydrolyzes to phosphoric acid); soluble in ethanol, diethyl ether. |
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