Manganous Phosphate. MnH.PO4 + 6Aq. Syn. Phosphate of protoxide of manganese; Manganesii phosphas, L. Prep. By precipitating a solution of manganous sulphate with a solution of sodium phosphate. It must be preserved from the air.—Dose, 3 to 12 gr.; in anæmia, rickets, &c.
Manganous Sul′phate. MnSO4. Syn. Sulphate of protoxide of manganese; Manganesii sulphas, L. Prep. 1. By dissolving manganous carbonate in dilute sulphuric acid, and evaporating the filtered solution so that crystals may form, or at once gently evaporating it to dryness. Pure.
2. (Commercial.) By igniting manganic peroxide (pyrolusite) mixed with about 1-10th of its weight of powdered coal in an iron crucible or gas-retort, and digesting the residuum of the calcination in sulphuric acid, with the addition after a time of a little hydrochloric acid; the solution of manganous sulphate thus obtained, after defecation, is
evaporated to dryness, and heated to redness as before; the mass, after ignition, is crushed small, and treated with water; the solution is nearly pure, the whole of the iron having been reduced into the state of insoluble peroxide. Used by the calico printers. Cloth steeped in the solution, and afterwards passed through a solution of chloride of lime, is dyed of a permanent brown.
Prop., &c. Pale rose-coloured crystals of the formulæ MnSO4, 7Aq.; MnSO4, 5Aq.; or MnSO4, 4Aq.; according to the method of crystallising, furnishing a solution of a rich amethystine colour. With sulphate of potassa it forms a double salt (‘manganese alum’).—Dose. As an alterative and tonic, 5 to 10 gr.; as a cholagogue cathartic, 1 to 2 dr., dissolved in water, either alone or combined with infusion of senna. According to Ure, its action is prompt and soon over; 1 dr. of it occasions, after the lapse of an hour or so, one or more liquid bilious stools. In large doses it occasions vomiting, and in excessive doses it destroys life by its caustic action on the stomach. (Dr G. C. Mitscherlich.) It has been administered with manifest advantage in torpor of the liver, gout, jaundice, syphilis, and certain skin diseases; and, combined with iron, in anæmia, chlorosis, rickets, &c.
Manganous Tar′trate. MnC4H4O6. Syn. Manganesii tartras, L. Prep. By saturating a solution of tartaric acid with most manganous carbonate. Alterative and tonic.—Dose, 4 to 12 gr.
Manganate of Barium. BaMnO4. Green insoluble powder, obtained by fusing barium hydrate, potassium chlorate, and manganic peroxide together, and washing the product.
Manganate of Potassium. K2MnO4. Finely powdered manganic peroxide, potassium chlorate, and potassium hydrate, made into a thick paste with water, and heated to dull redness. The fused product is treated with a small quantity of water, and crystallised by evaporation in vacuo.
Dark green, almost black crystals, readily soluble in water, but decomposed by excess, or by acids into manganic peroxide, and potassium permanganate.
Manganate of Sodium. Na2MnO4. Prepared on the large scale by heating a mixture of manganic peroxide and sodium hydrate to redness in a current of air. Used in strong solution as a disinfectant under the name of “Condy’s green fluid.”