MnSO4-4H2O
DEFINITION
Manganese Sulphate is manganese (II) sulphate tetrahydrate. It contains not
less than 98.0% and not more than 100.5% of MnSO4, calculated with reference to the
substance ignited at 450 to 500C.
CHARACTERISTICS
Pale pink crystals or crystalline powder.
Freely soluble in water; practically insoluble in ethanol (96%).
IDENTIFICATION
A. Dissolve 0.5 g in 10 ml of water and add 1 ml of sodium sulphide
solution. A pink precipitate is produced which is soluble in 6M acetic acid.
B. To 0.1 g add 2 g of lead-(IV) oxide and 5 ml of nitric acid , boil gently for a
few minutes, add 100 ml of water and filter. A purple solution is produced.
C. Yields the reactions characteristic of sulphates.
TESTS
Arsenic: 4 ppm
Heavy metals: 40 ppm
Iron: 40 ppm
Zinc: 500 ppm
Chloride: 330 ppm
Loss on ignition: When ignited to constant weight at 450° to 500°, loses
31.0 to 34.0% of its weight. Use 1 g.
Manganese Sulfate USP
MnSO4·H2O 169.02
Sulfuric acid, manganese(2+) salt (1:1) monohydrate.
Manganese(2+) sulfate (1:1) monohydrate [10034-96-5]
Anhydrous 151.00 [7785-87-7]
Manganese Sulfate contains not less than 98.0 percent and not more than 102.0 percent of MnSO4·H2O.
Identification:A solution (1 in 10) responds to the tests for Manganese 191
and for Sulfate.
Loss on ignition:Ignite it at 450 to constant weight: it loses between 10.0%
and 13.0% of its weight.
Substances not precipitated by ammonium sulfide: Dissolve 2.0 g in 90 mL of
water, add 5 mL of ammonium hydroxide, warm the solution, and pass hydrogen sulfide
through the solution for about 30 minutes. Dilute with water to 100 mL, mix, and
allow the precipitate to settle. Decant the supernatant through a filter, transfer
50 mL of the clear filtrate to a tarred dish, evaporate to dryness, and ignite,
gently at first and finally at 800 ± 25C: the weight of the residue does not exceed
5 mg (0.5%).
MnSO4-H2O Formula wt 169.02
CAS: [7785-87-7]
DESCRIPTION
Manganese Sulfate occurs as a pale-pink, granular powder. It is freely
soluble in water, but is insoluble in alcohol.
Function: Nutrient.
REQUIREMENTS
Identification: A 1:10 aqueous solution gives positive tests for
Manganese and for Sulfate.
Assay: Not less than 98.0% and not more than 102.0% of MnSO4·H2O.
Arsenic: Not more than 3 mg/kg.
Lead: Not more than 4 mg/kg.
Loss on Heating: Between 10.0% and 13.0%.
Selenium: Not more than 0.003%.Â
MnSO4-H2O Formula wt 169.02
CAS: [7785-87-7]
DESCRIPTION
Manganese Sulfate occurs as a pale-pink, granular powder. It is freely
soluble in water, but is insoluble in alcohol.
Function: Nutrient.
REQUIREMENTS
Identification: A 1:10 aqueous solution gives positive tests for
Manganese and for Sulfate.
Assay: Not less than 98.0% and not more than 102.0% of MnSO4·H2O.
Arsenic: Not more than 3 mg/kg.
Lead: Not more than 4 mg/kg.
Loss on Heating: Between 10.0% and 13.0%.
Selenium: Not more than 0.003%.Â
