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].

Packaging and storage— Preserve in tight containers. Store at 25, excursions permitted between 15 and 30.

Identification— A solution (1 in 10) responds to the tests for Manganese 191 and for Sulfate 191.

Loss on ignition 733— 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 tared dish, evaporate to dryness, and ignite, gently at first and finally at 800 ± 25: the weight of the residue does not exceed 5 mg (0.5%).

Organic volatile impurities, Method I 467: meets the requirements.

Residual solvents 467: meets the requirements.

Assay— Dissolve about 350 mg of Manganese Sulfate, accurately weighed, in 200 mL of water. Add about 10 mg of ascorbic acid, begin the titration by adding about 25 mL of 0.05 M edetate disodium VS, using a suitable buret, then add 10 mL of ammonia–ammonium chloride buffer TS, and about 0.15 mL of eriochrome black TS, and complete the titration with 0.05 M edetate disodium VS to a blue endpoint. Each mL of 0.05 M edetate disodium is equivalent to 8.451 mg of MnSO4·H2O.

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