Manual of qualitative analysis / by Robert Galloway.

  • Galloway, Robert.
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: Manual of qualitative analysis / by Robert Galloway. Source: Wellcome Collection.

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    tion ensues, even with a minute quantity of chlorate. The experiment must only be made with very minute quantities of chlorate. OrGANIC ACIDS. 482. Organic acids cannot be detected with the same certainty and precision as the inorganic acids. ‘To detect with certainty even some of those which we have given requires on the part of the analyst great skill and judg- ment. 483. Pretiminary Examination.—A portion of the solid substance in powder must be heated nearly to boiling with concentrated sulphuric acid, except when chloric acid is present, as it would be dangerous in that case to warm the solution. We will first notice the changes produced by sulphuric acid on the inorganic acids, and then on the organic acids. 484. Inorganic Acids.—Carbonic acid, hydrosulphuric acid, nitric acid, hydrochloric acid, and hydrofluoric acid are evolved from the carbonates, the sulphides, the nitrates, the chlorides, and the fluorides, by concentrated sulphuric acid. The vapour of nitric acid will generally have a brown colour; the vapour of hydrofluoric acid will etch glass; and the vapour of hydrochloric acid will fume in contact with air. A greenish gas, having a smell of chlorine, will be evolved if a chlerate is present, and the solution will become yellow ; vapours of bromine and iodine will be evolved if bromides and iodides are present; oxygen will be evolved if chromic acid is present, and the solution will become green ; carbonic oxide will be evolved, and its presence may be proved by burning it, if cyanides or oxalates are present; it will be attended, when the latter acid is present, with carbonic acid. The other inorganic acids give off