Sodium chloride dihydrate | SSHADE

Processing math: 100%

Solid phase

Official name: Sodium chloride dihydrate

Name and identifiers

Secondary names: Common salt, hydrated; Hydrohalite; Rock salt, hydrated; Sodium chloric dihydrate; NaCl dihydrate
CAS number: 23724-87-0

Family: ionic solid
Class: normal salt
Compound type: chloride
Comments: equivalent to mineral Hydrohalite

Chemical composition

Formula: $Na^+ \cdot Cl^- \bullet 2H_2O$
Chemical formula: NaCl•2H2O
Elemental formula: (Na+) (Cl-) H4 O2
Isotope mixture type: terrestrial abundance

8.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Na^+$	Sodium cation	element	1	0.25	1	constituent cation	main
	$Cl^-$	Chloride anion	element	1	0.25	1	constituent anion	main
	$H_2O$	Water	molecule	2	0.5	1	hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$R-OH$	2

Chemical bonds

	Bond	Number
	$Na^+ \cdot Cl^-$	6
	$-O \dots H-$	4
	$-O-H$	2

Class: normal salts (07)
Type: hydrated simple normal salts (07.04)

Associated phases

Equivalent mineral: Hydrohalite

Crystallography

Phase type: crystalline
Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: P2(1)/c

Physical properties

Molar mass: 94.473 $g/mol$
Density: 1.65 (calc.) $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid H2O	-0.1°C (273.05 K)

Optical properties

Refringence type: biaxial
Refringence sign: unknown
Refraction index $n_{\alpha}$: unknown
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent
Luster: vitreous

Links and Publications

Links