Griffith's materia medica and pharmacy : for the use of medical and pharmaceutical students.

Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: Griffith's materia medica and pharmacy : for the use of medical and pharmaceutical students. 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.

    452/480 (page 440)
    When all the hydrocyanic acid is thus expended in the forma- tion of this double cyanide, the further addition of nitrate of silver will cause the precipitation of insoluble cyanide of silver. Hence, if we know the amount of nitrate of silver required to produce a permanent precipitate, we can calculate the amount of hydrocyanic acid present. [For full explanation of this test, see p. 30.] v. VOLUMETRIC SOLUTION OF OXALIC ACID. (H,CA.2H,0 = 126.) PrejMration.—Dissolve 660 grains of oxalic acid in exactly 10,000 grain-measures of water. One thousand grain-measures contain 63 grains (J of an equiv.) of oxalic acid, and will therefore neutralise one equiva- lent in grains of an alkali or alkaline carbonate, the oxalic radical being bivalent. Use in estimating the following substances :— Grains Gr.-measures weight. of Vol. SoL 52*3 of Ammon. Carb. will require 1,000 191-0 „ Borax 1,000 85-0 „ Liq. Ammon. „ 500 52-3 „ Tort. 1,000 4375-0 „ „ Calcis 180 460-2 „ ,, ,, Sacch. 254 284-5 „ „ Plumbi Subacet. 500 462-9 „ „ Potassse 482 4375-0 „ ,, ,, Efferves. 150 458-0 „ „ Sodae 470 4375-0 „ ,, „ Efferves. 178 38-0 „ Plumbi Acetas 200 56-0 „ Potassa Caustica 900 50-0 „ ,, Bicarb. 500 83-0 „ ,, Carb. 980 102-0 „ ,, Citras. 1,000 122-0 „ „ Tartras. 990 204-0 „ „ ,, Acida 1,000 40-0-,, Soda Caustica 900 141-0 „ Tartarata 990 84-0 „ ,, Bicarb. „ 1,000 143-0 „ ,, Carb. 960 23-0 „ Sodium 975 Exact neutralisation is ascertained by litmus-paper.