Solid phase
Official name
Ammonium bicarbonate
Secondary names
Ammonium hydrogen carbonate; azanium;hydrogen carbonate; Carbonic acid, ammonium salt (1:1); Bicarbonate of ammonia; Monoammonium carbonate; Acid ammonium carbonate; (NH4)HCO3; (NH4+)(HCO3)-; NH5CO3; CH5NO3
CAS number
1066-33-7
Type
Family
ionic solid
Class
acid salt
Compound type
carbonate
Chemical composition
Formula
$(NH_4^+) \cdot HCO_3^-$
Chemical formula
(NH4)HCO3
Elemental formula
(N+) H5 C O2 (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
$HOCOO^-$ Bicarbonate 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
$-O \dots H-$ 2
$\geq N^+-H$ 4
$\eqslantgtr C-O-$ 1
$-O-H$ 1
$>C=O$ 1
$\eqslantgtr C-O^-$ 1
Class
acid salts (05)
Type
simple acid salts (05.01)
Group
bicarbonate or carbonate (05.01.01)
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
dipyramidal
Crystal class symbol
mmm (D2h)
Crystal spacegroup
Pccn
Molar mass
79.056 $g/mol$
Density
1.573 - 1.586 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid (decomposes) 41.9 °C (315.0 K)
Refringence type
biaxial
Refringence sign
negative
Birefringence
0.132
Refraction index $n_{\alpha}$
1.422
Refraction index $n_{\beta}$
1.536
Refraction index $n_{\gamma}$
1.554
Dispersion V
weak
Pure color
colorless
Color
colorless, white, light grey
Diaphaneity
transparent to translucent
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