Ammonium hydrogen sulfate (phase I) | SSHADE

Processing math: 63%

Solid phase

Official name: Ammonium hydrogen sulfate (phase I)

Name and identifiers

Secondary names: Ammonium bisulfate; azanium;hydrogen sulfate; Ammonium hydrogensulphate; Sulfuric acid, monoammonium salt; Acid ammonium sulfate; Monoammonium sulfate; (NH4)HSO4; (NH4)HSO4; (NH4)HSO4-I; (NH4+)HSO42-; H5NO4S
CAS number: 7803-63-6

Family: ionic solid
Class: acid salt
Compound type: sulfate

Chemical composition

Formula: $(NH_4^+) \cdot HSO_4^-$
Chemical formula: (NH4)HSO4
Elemental formula: (N+) H5 S O3 (O-)
Isotope mixture type: terrestrial abundance

4.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$NH_4^+$	Ammonium ion	molecule	1	0.5	1	constituent cation	main
	$HSO_4^-$	Hydrogen sulfate ion	molecule	1	0.5	1	constituent anion	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$H_4 >\mid N^+$	1

Chemical bonds

	Bond	Number
	$>\mid N^+ \cdot O^{-}-$	1
	$\geq N^+-H$	4
	$-\gg S-O^{-}$	1
	$\geqq S=O$	2
	$-\gg S-O-$	1
	$-O-H$	1

Class: acid salts (05)
Type: simple acid salts (05.01)
Group: sulfate (05.01.09)

Crystallography

Phase name: Ammonium hydrogen sulfate-I
Phase type: crystalline
Crystal system: triclinic
Crystal class: pedial
Crystal class symbol: 1 (C1)
Crystal spacegroup: P1
Comments: nonferroelectric phase

Physical properties

Molar mass: 115.109 $g/mol$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid decompose	120 °C (393 K)
solid-solid	(NH4)HSO4-II	below -119°C (154 K)

Phase transitions comments

ferroelectric to nonferroelectic phase transition at 154K

Optical properties

Refringence type: biaxial
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent to translucent

Links and Publications

Links