Solid phase
Official name
Ammonium hydrogen sulfate (phase I)
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
Type
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
  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)
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
Molar mass
115.109 $g/mol$
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
Refringence type
biaxial
Pure color
colorless
Color
colorless, white
Diaphaneity
transparent to translucent
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