Sodium chloride (data page)

This page provides supplementary chemical data on sodium chloride.

Material safety data sheet

The handling of this chemical may incur notable safety precautions. It is highly recommended that you seek the material safety data sheet (MSDS) for this chemical from a reliable source such as eChemPortal, and follow its direction.

Structure and properties

Structure and properties
Index of refraction, nD	1.5442
Abbe number	?
Dielectric constant,	6.12 at 17–22 °C
Bond strength	?
Bond length	?
Bond angle	?
Magnetic susceptibility	−30.3×10−6 cgs

Thermodynamic properties

Phase behavior
Triple point	1074 K (801 °C), 30 Pa
Critical point	3900 K (3600 °C), 26×106 Pa
Std enthalpy change of fusion, ΔfusHo	27.95 kJ/mol (0.52 kJ/g)[1][2]
Std entropy change of fusion, ΔfusSo	26.02 J/(mol·K)
Std enthalpy change of vaporization, ΔvapHo	130.05 @ T-Boiling kJ/mol
Std entropy change of vaporization, ΔvapSo	? J/(mol·K)
Solid properties
Std enthalpy change of formation, ΔfHosolid	−411.12 kJ/mol[2]
Standard molar entropy, Sosolid	72 J/(mol·K)
Heat capacity, cp	50 J/(mol·K) ; 0.853 J/(g·k)[2]
Liquid properties
Std enthalpy change of formation, ΔfHoliquid	−385.92 kJ/mol
Standard molar entropy, Soliquid	95.06 J/(mol·K)
Density	1.549 g/cm3,[2] at 850 °C
Heat capacity, cp	? J/(mol·K)
Boiling point	1465 °C[2]
Gas properties
Std enthalpy change of formation, ΔfHogas	−181.42 kJ/mol
Standard molar entropy, Sogas	229.79 J/(mol·K)
Heat capacity, cp	? J/(mol·K)

Density data of aqueous solutions

Water–NaCl phase diagram

Properties of water–NaCl mixtures ^[3]

NaCl, wt%	Teq, °C	ρ, g/cm3	n	η, mPa·s
0	0	0.99984	1.333	1.002
0.5	−0.3	1.0018	1.3339	1.011
1	−0.59	1.0053	1.3347	1.02
2	−1.19	1.0125	1.3365	1.036
3	−1.79	1.0196	1.3383	1.052
4	−2.41	1.0268	1.34	1.068
5	−3.05	1.034	1.3418	1.085
6	−3.7	1.0413	1.3435	1.104
7	−4.38	1.0486	1.3453	1.124
8	−5.08	1.0559	1.347	1.145
9	−5.81	1.0633	1.3488	1.168
10	−6.56	1.0707	1.3505	1.193
12	−8.18	1.0857	1.3541	1.25
14	−9.94	1.1008	1.3576	1.317
16	−11.89	1.1162	1.3612	1.388
18	−14.04	1.1319	1.3648	1.463
20	−16.46	1.1478	1.3684	1.557
22	−19.18	1.164	1.3721	1.676
23.3	−21.1
23.7	−17.3
24.9	−11.1
26.1	−2.7
26.28	0
26.32	10
26.41	20
26.45	25
26.52	30
26.67	40
26.84	50
27.03	60
27.25	70
27.5	80
27.78	90
28.05	100

Note: ρ is density, n is refractive index at 589 nm,^{[clarification needed]} and η is viscosity, all at 20 °C; T_eq is the equilibrium temperature between two phases: ice/liquid solution for T_eq < 0–0.1 °C and NaCl/liquid solution for T_eq above 0.1 °C.

Spectral data

UV-Vis
λmax	? nm
Extinction coefficient, ε	?
IR
Major absorption bands	? cm−1
NMR
Proton NMR
Carbon-13 NMR
Other NMR data
MS
Masses of main fragments

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• Except where noted otherwise, data relate to Standard temperature and pressure.
• Reliability of data general note.