Mohr's salt (Ammonium ferrous sulfate), 1kg

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