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Iron II Sulfate
Posted: 16 May 2022, 14:47
by RosalieL
I have done a search but haven't found my answer... I have a sample pot (specimen jar) of ferrous ammonium sulfate (label printed by previous labbie) and the hand written chemical formula on it is wrong. It is a very pale green salt. Would this be iron II or iron III? Is there a way to work it out? I am wanting to buy a new bottle of it so I can get rid of this one but I'm not sure which one to buy. Do you use both types? I am happy to get both if they will be used!
Re: iron ammonium sulphate
Posted: 16 May 2022, 15:32
by Labbie
Ammonium iron(II) sulfate
Chemical compound
Ammonium iron(II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH₄)₂Fe(SO₄)₂(H₂O)₆. Containing two different cations, Fe²⁺ and NH₄⁺, it is classified as a double salt of ferrous sulfate and ammonium sulfate. Wikipedia
Formula: (NH₄)₂Fe(SO₄)₂·6H₂O
Molar mass: 392.14 g/mol
Appearance: Blue-green solid
Boiling point: Not applicable
Solubility in water: 269 g/L (hexahydrate)
Density: 1.86 g/cm3
Melting point: 100 to 110 °C (212 to 230 °F; 373 to 383 K)