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Updated: May 3, 2025
The accuracy of the results depend chiefly upon the following of certain fixed rules, such as, for instance, that the precipitation of copper only takes place when there is a definite amount of nitric acid in the solution; that of cobalt and nickel when a certain quantity of ammonium hydrate and ammonium sulphate is present.
Herodotus cites the names of a number of people who inhabited North Africa, mostly confining himself to repeat the fables or the more interesting facts, of which they were the object. The nomenclature of Strabo is neither so extensive, nor does it contain more precise or correct information. He mentions the celebrated oasis of Ammonium and the nation of the Nasamones.
Those in most common use are iron wire, ferrous ammonium sulphate, sodium oxalate, oxalic acid, and some other derivatives of oxalic acid. With the exception of sodium oxalate, these all contain water of crystallization which may be lost on standing. They should, therefore, be freshly prepared, and with great care.
On the residue I pour a few drops of ammonia, or else simply water. A glorious crimson colour at once makes its appearance. The problem is solved: the colouring-matter which has just formed is murexide; and consequently the powdery substance which filled the cells was none other than uric acid, or more precisely ammonium urate. A physiological fact of this importance can hardly stand alone.
The reduction may be accelerated by the addition of some ammonium sulphate. The antimony separates out as a fine, light gray precipitate on the electrode, and which adheres very firmly, provided the precipitation has not been carried on too rapidly, i. e., if the current employed for the reduction was not too strong.
When the hot hours of the day were past, the caravan again made, ready to go on. The merchant, Pentaur, summoned Timokles, and with condescending good-nature, demanded his history. Timokles told it. "Why shouldest thou be a Christian?" commented Pentaur. "See, we come to-night to Ammonium the oasis. Every camel-step doth lead thee farther toward Carthage! Thou wilt perish there!
MENOPAUSE: Ammonium bromide, two drams; Potassium bromide, four drams; aromatii spirits amoniae, six drams; camphor water enough to make six ounces. Dose: One dessertspoonful, three times a day. MENORRHAGIA: Gallic acid, fifty grains; Ergotin, twenty grains; Hydrastin, ten grains. Make twenty pills. Dose: One pill after meals.
Other watchglasses, treated with sulphide of ammonium or sulphate of iron and liquor potassæ, will give the reactions of the acid with appropriate tests. This method removes all objections as to foreign admixture. If the acid is not at first detected, gentle warming of the bottle in a water-bath will assist the evolution of the vapour.
The action of the vapor of the ammonium hydrosulphide will cause the obliterated writing to slowly turn brown, then black. But within a short time after removal from the box the writing will again disappear. Another method is to wash the document carefully in a solution of hydrochloric acid, one part, and distilled water, one hundred parts.
What weight in grams of impure ferrous ammonium sulphate should be taken for analysis so that the number of centigrams of BaSO obtained will represent five times the percentage of sulphur in the sample? !Answer!: 0.6870 gram.
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