Na₂HPO₄

Formula : Na₂HPO₄

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Dernière mise à jour le 25.01.2021

Individual properties (298.15 K)

M g·mol^-1	V° cm³·mol^-1	ΔGº_f J·mol^-1	ΔHº_f J·mol^-1	Sº J·mol^-1·k^-1	C_P J·mol^-1·K^-1
141.959	55.020 (Ref.: 84nri) Nriagu J.O., 1984, Formation and stability of base metal phosphates in soils and sediments, Chap. 10. In: Phosphate Minerals, J.O. Nriagu and P.B. Moore (Eds), Springer-Verlag, ISBN 3-540-12757-7, 318-329	-1608317 (Ref.: Internal calculation)	-1748100 (Ref.: 82wag/eva) Wagman D.D., Evans W.H., Parker V.B., Schumm R.H., Halow I., Bailey S.M., Churney K.L., and Nutall R.L., 1982. The NBS Tables of Chemical Thermodynamic Properties. J. Phys. Chem. Ref. Data, 11, Suppl. 2.	150.500 (Ref.: 67and/cou) Andon R.J.L., Counsell J.F., Martin J.F., and Mash C.J., 1967. Thermodynamic properties of phosphorus compounds: II. Low temperature heat capacity and entropy of sodium mono-, di-, and triphosphates. J. Appl. Chem., 17, 65-70	135.31 (Ref.: 67and/cou) Andon R.J.L., Counsell J.F., Martin J.F., and Mash C.J., 1967. Thermodynamic properties of phosphorus compounds: II. Low temperature heat capacity and entropy of sodium mono-, di-, and triphosphates. J. Appl. Chem., 17, 65-70

C_P(T) = a + b·T + ·c·T^-2 (T in Kelvin)

a J·mol^-1·K^-1	*b 10³** J·mol^-1·K^-2	*c 10^-5** J·K·mol^-1	Maier Kelley Ref.
135.31	0.00	0.00	(Ref.: 67and/cou) Andon R.J.L., Counsell J.F., Martin J.F., and Mash C.J., 1967. Thermodynamic properties of phosphorus compounds: II. Low temperature heat capacity and entropy of sodium mono-, di-, and triphosphates. J. Appl. Chem., 17, 65-70

Reaction properties

Na₂HPO₄ + H⁺ ⇌ 2Na⁺ + H₂PO₄^-

298.15 K, 1 bar log₁₀K: 9.24 ΔH°_r:-35180 J·mol^-1

T(°C)	0	25	60	100	150	200	250	300
log₁₀K	9.78	9.24	8.57	7.93	7.24	6.62	6.01	5.29

log₁₀K(T) = A + B·T + C·T^-1 + D·log₁₀(T) + E·T⁻² (T in Kelvin)

A	B	C	D	E
-841.289905	-0.128848	48346.710455	306.126615	-2729056.334986