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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 ).
10 Ιουλ 2024 · H3PO4: Melting Point: 42.35°C (solid form) Boiling Point: 158°C (decomposes) Density: 1.885 g/cm³ (at 85% concentration) Solubility: Completely soluble in water, forming a mildly acidic solution: pH: Highly acidic, with a pH of around 2 in its common concentrations
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.
23 Μαΐ 2018 · H 3 PO 4. ELEMENTS: Hydrogen, phosphorus, oxygen. COMPOUND TYPE: Inorganic acid. STATE: Solid. See Overview. MOLECULAR WEIGHT: 98.00 g/mol. MELTING POINT: 42.4°C (108°F) BOILING POINT: 407°C (765°F) SOLUBILITY: Very soluble in water and ethyl alcohol. Phosphoric acid is the ninth highest volume chemical produced in the United States.
25 Μαΐ 2022 · The formal definition in science is that boiling point is the temperature where the vapor pressure of a liquid equals the vapor pressure of its environment. At this temperature, the liquid changes into the vapor (gas) phase.
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. Pure anhydrous phosphoric acid is a white solid with a melting point of 42 C. Phosphoric acid has three pKa values covering a wide range (pKa's: 2.15, 7.20, 12.32).
Our main objective was to improve the possibilities of calculating the standard thermodynamic properties for both molecular and ionized phosphoric acid in aqueous solution over a wide range of temperatures and pressures using new experimental data and a better theoretically founded model.
