IUPAC-NIST Solubilities Database

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IUPAC-NIST Solubility Database NIST Standard Reference Database 106 Glass Ball as Bullet Solubility System: Ammonium dihydrogenphosphate with Urea, Potassium chloride and Water Components: (1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1] NIST Chemistry WebBook for detail (2) Potassium dihydrogenphosphate; KH2PO4; [7778-77-0] NIST Chemistry WebBook for detail (3) Urea; CH4N2O; [57-13-6] NIST Chemistry WebBook for detail (4) Water; H2O; [7732-18-5] NIST Chemistry WebBook for detail Original Measurements: Bergman, A.G.; Gladkovskaya, A.A.; Galushkina, R.A., Zh. Neorg. Khim. 1973, 18, 1978. Variables: Concentration = Composition and temperature. Prepared By: J. Eysseltová Experimental Remarks: Remarks: Four sections through the system were investigated. The sections are: No. 1 (45.81% NH4H2PO4 + 54.19% KH2PO4)-urea-water; No. 2 (71.72% NH4H2PO4 + 28.28% KH2PO4)-urea-water; No. 3 (65.70% NH4H2PO4 + 34.30% urea)-KH2PO4-water; No. 4 (85.18% NH4H2PO4 + 14.82% urea)-KH2PO4-water. Experimental Data: (Notes on the Nomenclature) (Please see footnotes following the table(s).) Solubility data for saturated solutions in the urea-NH4H2PO4-KH2PO4-H2O system.
Solution numbert/°CChemical1102 * Mass Fraction w1m1(a)Chemical2102 * Mass Fraction w2m2(a)Chemical3102 * Mass Fraction w3m3(a)Chemical4102 * Mass Fraction w4Solid Phase(s)(b)
1+6.4urea1.800.38NH4H2PO49.341.04KH2PO411.061.04H2O77.80A + B + C
1-4.1urea1.500.30NH4H2PO48.060.86KH2PO49.540.86H2O80.90A + B + D
1-8.0urea12.602.84NH4H2PO46.230.73KH2PO47.370.73H2O73.8B + C + D
1+8.0urea40.0013.48NH4H2PO44.860.85KH2PO45.740.85H2O49.4C + F + G
1-6.0urea32.803.41NH4H2PO44.200.62KH2PO45.000.63H2O58.00C + E + F
1-18.0urea28.408.50NH4H2PO48.981.40KH2PO410.621.40H2O55.60C + D + E
2+19.4urea1.200.28NH4H2PO421.302.67KH2PO48.400.89H2O69.10A + B + C
2-5.5urea1.400.29NH4H2PO414.341.58KH2PO45.660.52H2O78.60A + B + D
2-8.8urea24.506.76NH4H2PO410.901.57KH2PO44.300.52H2O60.30B + C + E
2-7.0urea32.009.68NH4H2PO49.321.47KH2PO43.680.49H2O55.00C + E + F
2+9.6urea41.0012.88NH4H2PO48.651.41KH2PO43.350.46H2O53.00C + F + G
2-16.00urea24.606.72NH4H2PO410.401.48KH2PO44.100.49H2O60.90B + D + E
3+26.5urea11.733.17NH4H2PO422.473.17KH2PO44.200.50H2O61.60A + B + C
3-8.0urea6.521.45NH4H2PO412.481.45KH2PO46.500.64H2O74.50A + B + D
4+17.0urea4.3010.52NH4H2PO424.703.15KH2PO43.000.32H2O68.00A + B + C
4-5.2urea2.705.22NH4H2PO415.701.74KH2PO43.500.32H2O78.10A + B + D
 Notes: Table 1 a The compiler calculated the molalities as mol/kg H2O values. Table 1 b The solid phases are: A=α-NH4H2PO4; B=(α-NH4·K)H2PO4; C=(β-NH4·K)H2PO4; D=ice; E=α-urea; F=β-urea; G=γ-urea. Method/Apparatus/Procedure: A visual polythermic method was used.1 Source and Purity of Materials: Chemically pure salts and bidistilled water were used. Estimated Errors: Solubility: No information is given. Temperature: No information is given. References: 1Bergman, A.G.; Luzhnaya, N.P. Fiziko-Khimicheskie Osnovy Izucheniya i Ispol'zovaniya Solyanykh Mestorozhdeniy Khlorid-sul'fatnogo Tipa, Moscow, IAN SSSR, 1951.

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