flocculent precipitate

noun

Chemistry.

1. a woolly-looking precipitate, as aluminum hydroxide formed by the addition of ammonia to an aluminum-salt solution.

Word History and Origins

Origin of flocculent precipitate¹

First recorded in 1790–1800

Example Sentences

It dissolves readily in water and the aqueous solution decomposes on standing; a dark-brown flocculent precipitate of azulmic acid, C4H5N5O, separating whilst ammonium oxalate, urea and hydrocyanic acid are found in the solution.

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He also obtained a flocculent precipitate which later became granular and showed under the microscope forms like the starfish, and discs with undulated borders.

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Large, persistent bubbles should form on the surface of the liquid and the casein be present as an extremely fine flocculent precipitate which remains suspended for a considerable time.

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When the decoction becomes slightly alkaline, it deposites a red flocculent precipitate, and the fluid is changed from a yellow to a crimson colour.

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The solution is then filtered from a white flocculent precipitate, which contains most of the impurities, into a larger conical flask, of some 500-600 c.c. capacity, and after cooling, rendered just neutral to phenol-phthalein by means of N/2 caustic soda solution, the exact point being reached when the solution acquires a reddish-yellow tint; 25 c.c. of a strong caustic soda solution is then added, and the liquid boiled for about fifteen minutes, the excess of alkali being titrated after cooling, with N/1 or N/2 hydrochloric acid.

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