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Concentrated solutions of H3PO4(aq) are used as electrolytes in fuel cells operating typically at temperatures from 425 to 550 K. Phosphate ions, as water softeners and buffering agents, can be present in power cycles where temperatures may reach beyond the critical point of water.
Aqueous solutions up to 62.5% H 3 PO 4 are eutectic, exhibiting freezing-point depression as low as -85°C. When the concentration of acid rises above 62.5% the freezing-point increases, reaching 21°C by 85% H 3 PO 4 (w/w; the monohydrate ).
6 Αυγ 2020 · Boiling point: 485 K or 212 °C Melting point: 315.5 K or 42.35 °C (of crystalline solid) Dynamic viscosity: 2.4 to 9.4 centipoise (85% aqueous solution) Density: 1.83 g/cm 3 (solid); 1.68 g/cm 3 (85% aqueous solution at 25 °C) Structure. The H 3 PO 4 Lewis structure. The H 3 PO 4 compound has a total of 32 valence electrons. Since Phosphorus ...
Quantity Value Units Method Reference Comment; Δ f H° liquid-1271.66: kJ/mol: Review: Chase, 1998: Data last reviewed in December, 1971: Quantity Value Units Method Reference
Concentrated solutions of H3PO4 (aq) are used as electrolytes in fuel cells operating typically at temperatures from 425 to 550 K. Phosphate ions, as water softeners and buffering agents, can be present in power cycles where temperatures may reach beyond the critical point of water.
The boiling point of phosphoric acid is 158°C (316°F) at 1 atm pressure. This means that at this temperature and pressure, the liquid phase of phosphoric acid will convert to a gaseous phase.
General Information: Structure: CAS Number: 7664-38-2. Molecular Weight: 97.99 g/mol. Appearance: Colorless, viscous liquid (85% aq) Boiling Point: 158 C (85% aq) Density: 1.685 g/mL (85% aq) The most common form of phosphoric acid (H3PO4) is the 85% aqueous form.
