Ammonium iron(II) sulfate, or Mohr's Salt, is the inorganic compound with the formula (NH4)2Fe(SO4)2·6H2O. Containing two different cations, Fe2+ and NH4+, it is classified as a double salt of ferrous sulfate and ammonium sulfate. It is a common laboratory reagent. Like the other ferrous sulfate salts, ferrous ammonium sulfate dissolves in water to give the aquo complex [Fe(H2O)6]2+, which has octahedral molecular geometry.
This compound is a member of a group of double sulfates called Schönites or Tutton's salts. which form monoclinic crystals and have formula M2N(SO4)2.6H2O. This group can mix metals and crystallise on other schönite crystals.
Mohr's salt is prepared by dissolving an equimolar mixture of hydrated ferrous sulfate and ammonium sulfate in water containing a little sulfuric acid, and then subjecting the resulting solution to crystallization. Ferrous ammonium sulfate forms light green crystals.
Specificaion of Ferrous Sulphate
Grade | Ferrous Sulphate heptahydrate | Ferrous Sulphate Monohydrate |
| Item | FeSO4.7H2O | FeSO4.H2O |
| Assay % Min | 98 | 91 |
| Fe % Min | 19.7 | 30 |
| Pb % Max | 0.002 | 0.002 |
| As % Max | 0.0002 | 0.0002 |
| Cd % Max | 0.0005 | 0.0005 |
| Size | Through 40 Mesh Sieve | Through 40 Mesh Siev |
Application:-
In analytical chemistry, this salt is preferred over other salts of ferrous sulfate for titration purposes as it is much less prone to oxidation by air to iron(III). The oxidation of solutions of iron(II) is very pH dependent, occurring much more readily at high pH.
The ammonium ions make solutions of Mohr's salt slightly acidic, which slows this oxidation process. Sulfuric acid is commonly added to solutions to reduce oxidation to ferric iron.
Mohr's salt is named after the German chemist Karl Friedrich Mohr, who made many important advances in the methodology of titration in the 19th century.
It is used in the Fricke's dosemeter to measure high doses of gamma rays.
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