Hg=199.8.

I. Hydrargyrum. - Mercury. Synonym. - Quicksilver.

Source

Cinnabar, the native Sulphide, is roasted or distilled with Lime; the volatile Mercury is condensed in suitable aludels.

Characters

A shining, silver-white metal, easily divisible into small globules. Sp. gr. 13.5584.

Impurity

Lead, tin, and other metals.

Preparations

1. Hydrargyrum Cum Creta. Mercury With Chalk

Hydrargyrum Cum Creta. Mercury With Chalk. Synonym. - Gray powder.

By trituration of Mercury, 38; Prepared Chalk, 57; Clarified honey, 10; with sufficient water to 100. By keeping, the Mercury is liable to become Mercuric Oxide, which makes the powder more active. ' Strength. - 38 per cent. of Mercury.

Dose, 1/2 to 10 gr.; .03 to .60 gm.

2. Emplastrum Hydrargyri. Mercurial Plaster

Emplastrum Hydrargyri. Mercurial Plaster. Mercury, 300; Oleate of Mercury, 12; Lead Plaster to 1000. Strength. - 30 per cent. of Mercury.

3. Emplastrum Ammoniaci Cum Hydrargyro.Ammoniac Plaster With Mercury

Emplastrum Ammoniaci Cum Hydrargyro.Ammoniac Plaster With Mercury. Mercury, 180; Oleate of Mercury, 8; an evaporated solution of Ammoniac. 720; in diluted Acetic Acid, 1000; and Lead Plaster a sufficient quantity to 1000. Strength. - 18 per cent. of Mercury.

4. Massa Hydrargyri. Mass Of Mercury

Massa Hydrargyri. Mass Of Mercury. Synonyms. - Blue Mass. Blue Pill. Pilula Hydrargyri. Mercury, 33; Honey of Rose, 34; Glycyrrhiza, 5; Althaea, 25; Glycerin, 3. Strength. - 33 per cent. of Mercury.

Dose, 1/2 to 15 gr.; .03 to 1.00 gm.

5. Unguentum Hydrargyri. Mercurial Ointment

Unguentum Hydrargyri. Mercurial Ointment. Synonym. - Blue Ointment. Mercury, 500; Lard, 250; Suet, 230; Oleate of Mercury, 20. - Strength. - 50 per cent. of Mercury. a. Hydrargyri Oxidum Rubrum. - Red Mercuric Oxide. HgO=2i5.76. Synonym. - Red Precipitate.

Source

Dissolve Mercury in diluted Nitric Acid. 3Hg+8Hno3= 3Hg(No3)2+2NO+4H2O. Evaporate to dryness. Triturate the Mercuric Nitrate thus formed, with Mercury, and heat. 2Hg(No3)2+Hg2=4HgO+ 2N2O4.

Characters

Heavy orange-red, crystalline scales, or a crystalline powder; having a somewhat metallic taste. Solubility. - Almost insoluble in water.

Impurities

Red lead, brick dust, and mercuric nitrate.

Dose, 1/4 to 1 gr.; .015 to .06 gm.

Preparation

Unguentum Hydrargyri Oxidi Rubri

Ointment of Red Mercuric Oxide. Synonym. - Red Precipitate Ointment Red Mercuric Oxide, 10; Castor Oil, 5; Ointment, 85.

3. Hydrargyri Oxidum Flavum. Yellow Mercuric Oxide

Hydrargyri Oxidum Flavum. Yellow Mercuric Oxide. HgO=215.76.

Source

Precipitate a solution of Corrosive Mercuric Chloride, 1000; with Soda, 40. HgCl2+2NaOH=HgO+2NaCl+H2O.

Characters

A light orange-yellow, amorphous, heavy, impalpable powder, having a somewhat metallic taste. Not given internally. It is contained in Lotio Hydrargyri Flava B. P. - Corrosive Mercuric Chloride, I; Lime Water, 240. It has the same composition as the Red Oxide, but is more crystalline.

Preparations