Table 4-2Physical and Chemical Properties of Manganese and Compoundsa

PropertyManganeseMn(II) chlorideManganese sulfate
Molecular weight54.94b125.85b151.00b
ColorSteel-graybPinkPale rose-red
Physical stateSolidSolidSolid
Melting point1,244 °Cc650 °C700 °C
Boiling point2,095 °Cb1,412 °Cb850 °C (decomposes)
Density at 20 °C7.26 g/cm3 b at 20 °C2.325 g/cm3 at 25 °C b3.25 g/cm3 d
OdorNo dataNo dataOdorless
Odor threshold:
  WaterNo dataNo dataNo data
  AirNo dataNo dataNo data
Solubility:
  Water at 20 °CDecomposesNo dataNo data
  AcidsReacts with diluted mineral acids with evolution of hydrogen and formation of divalent manganous saltsbNo dataNo data
  Organic solventsNo dataSoluble in alcohol, insoluble in etherSoluble in alcohol, insoluble in ether
Partition coefficients:
  Log KowNo dataNo dataNot applicable
  Log KocNo dataNo dataNot applicable
Vapor pressure at 20 °C1 Pa at 955 °Cc1,000 Pa at 760 °CcNo data
Henry's law constant at 25 °CNo dataNot applicableNot applicable
Autoignition temperatureNo dataNoncombustibleNo data
FlashpointNo dataNo dataNo data
Flammability limitsFlammable and moderately explosive in dust form when exposed to flamedNo dataNo data
Conversion factorsNot applicableNot applicableNot applicable
Explosive limitsMixture of aluminum and manganese dust may explode in air. Mixtures with ammonium nitrate may explode when heateddNo dataNo data
ReactivityHydrogend; when heated above 200 °C in presence of nitrogen, forms nitrode; violent reaction with NO2 and oxidants; incandescent reaction with phosphorous, nitryl fluoride, nitric aciddNo dataNo data
Molecular weight228.81b86.94b158.03b
ColorBrownish-blackbBlackPurple
Physical stateSolidSolidSolid
Melting point1,564 °C Loses oxygen at535 °Cd<240 °C (decomposes)
Boiling pointNo dataNo dataNo data
Density at 20 °CNo data5.0 g/cm3 d2.703 g/cm3
OdorNo dataNo dataOdorless
Odor threshold:
  WaterNo dataNo dataNo data
  AirNo dataNo dataNo data
Solubility:
  Water at 20 °CInsolubleInsolubleNo data
  AcidsSoluble in hydrochloric acidSoluble in hydrochloric acidSoluble in sulfuric acid
  Organic solventsNo dataNo dataSoluble in acetone
Partition coefficients:
  Log KowNot applicableNo dataNo data
  Log KocNot applicableNo dataNo data
Vapor pressure at 20 °CNo dataNo dataNo data
Henry's law constant at 25 °CNot applicableNo dataNo data
Autoignition temperatureNo dataNo dataNo data
FlashpointNo dataNo dataNo data
Flammability limitsNo dataNo dataNo data
Conversion factorsNot applicableNot applicableNot applicable
Explosive limitsNo dataNo dataNo data
ReactivityNo dataNo dataSpontaneously flammable on contact with ethylene glycol
Molecular weight114.95757.4e218.1
ColorPinkcNo dataYellow to dark orange
Physical statehexagonal, crystalscLiquid (solution for infusion)Liquid, solid below 2 °C
Melting pointDecomposesNo data1.5 °Cd
Boiling pointNo dataNo data232 °C
Density at 20 °C3.70 g/cm3 c1.537 g/cm3 b1.39 g/cm3
OdorNo dataNo dataFaint, pleasant
Odor threshold:
  WaterNo dataNo dataNo data
  AirNo dataNo dataNo data
Solubility:
  Water at 20 °CInsoluble459.6 g/LbInsoluble
  AcidsSoluble in dilute acidcNo dataNo data
  Organic solventsNo data23 g/L (methanol); 0.8 g/L (ethanol); 0.6 g/L (acetone); 1.1 g/L (chloroform)bReadily soluble in hydrocarbons and the usual organic solvents including hexane, alcohols, ethers, acetone, ethylene glycol, lubricating oils, gasoline and diesel fuelb
Partition coefficients:
  Log KowNo data−5.62bNo data
  Log KocNo dataNo dataNo data
Vapor pressure at 20 °CNo dataNo dataRanges from 8 mm Hg at 100 °C to 360.6 mm Hg at 200 °Cb
Henry's law constant at 25 °CNo dataNo dataNo data
Autoignition temperatureNo dataNo dataNo data
FlashpointNo dataNo data110 °C
Flammability limitsNo dataNo dataNo data
Conversion factorsNot applicableNo dataNo data
Explosive limitsNo dataNo dataNo data
ReactivityNo dataNo dataLight (decomposes)
a

All information obtained from Sax and Lewis 1987, except where noted.

b

O’Neil et al. 2006.

c

Lide 2000.

d

Lewis 2000.

e

RTECS 2007.

f

Data for MMT from NIOSH 2005 unless otherwise noted.

All information obtained from Sax and Lewis 1987, except where noted.

From: 4, CHEMICAL AND PHYSICAL INFORMATION

Cover of Toxicological Profile for Manganese
Toxicological Profile for Manganese.
Williams M, Todd GD, Roney N, et al.

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