Materia medica and pharmacy : for the use of medical and pharmaceutical students preparing for examination / by W. Handsel Griffiths ; edited, and in part written, by George F. Duffey.

Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: Materia medica and pharmacy : for the use of medical and pharmaceutical students preparing for examination / by W. Handsel Griffiths ; edited, and in part written, by George F. Duffey. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    a white precipitate, soluble in excess, and which is not formed if tartaric acid be previously added. Antimonial salts are thus dis- tinguished from salts of bismuth, which also give precipitates with water, but are not dissolved by tartaric acid. Twenty grains dis- solve without residue in a fluid ounce of distilled water at 60°, and the solution gives with sulphuretted hydrogen an orange precipitate, which, when washed and dried at 212°, weighs 9-01 grains. Solution of tartar emetic is not precipated by ferrocyanide of potassium, chloride of barium, or nitrate of silver, unless it be concentrated. COMPOUNDS OF SILVER. [Ag=108] Name B. P. Prep. Strength Dose Action and Use. Akgenti Nitras. ^0 i gr. Externally a.stringent, in-itant, Niti-ate of Silver vesicant, and escharotic. AgNOg Internally astringent, and alterative to alimentary mucous membrane. Used in chronic gastric affections, diarrhoea, i&c. Nervine tonic. Given in epilepsy and cliorea. Volumetric 17grs.inl,000 Used in testing Acid. Hydro- Solution of cyanic. Dil., Potass. Bromid., (App. HI.) and Sodae Arsenias. Aegenti Oxidum J gr. to 2 grs. Similar action to the nitrate, Oxide of Silver but is less energetic topi- AgsO cally. PKEPARATION. Nitrate of Silver. Add nitric acid (2^ ozs.) and water (5 ozs ) to refined silver (3 ozs.) in a flask, and apply a gentle heat till the metal is dissolved:— 3 Ag + 4HNO3 = 3 AgNOa -f NO + 2 H2O. Decant the clear liquor from any black powder (trace of gold or of sulphide of silver) which may be present, into a porcelain dish; evaporate, and set aside to crystallise. Let the crystals drain in a glass funnel, and dry them by exposure to the air, carefully avoid- ing the contact of all organic substances. To obtain the nitrate of silver in rods, fuse the crystals in a capsule of platinum or thin porcelain, and pour the melted salt into proper moulds. From the Nitrate is prepared:— Oxide of Silver. Dissolve nitrate of silver (^oz.) in distilled water (4 ozs.), and having poured the solution into a bottle containing solution of lime (3i pints), shake the mixture well and set aside to allow the deposit to settle:— 2 AgN O3 + Ca2 HO = Ca2N03 + Ag^O + H,0. Draw off the supernatant liquid, collect the deposit on a filter, wash it with distilled water, and dry it at a heat not exceeding 212°.
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