Precipitate

Definition and stakes

C. Beringer,  A Text-book of Assaying: For the Use of Those Connected with Mines

“ Precipitation.—In precipitating add sufficient of the reagent to complete the reaction. The student must be on his guard against adding a very large excess, which is the commoner error. In some reactions the finishing point is obvious enough; either no more precipitate is formed, or a precipitate is completely dissolved, or some well-marked colour or odour is developed or removed. ”
Source: Gutenberg

Amanda K. Beck,  A reference hand-book for nurses (1919)

“ Concentrated urine, when it cools, deposits a pinkish (brick-dust) precipitate. Gentle heat clears it up. When highly concentrated the crystals are red. When they collect and adhere together they become stones; if all precipitate on heating it is normal urine.
Alkaline urine throws down phosphates that are held in solution and clears up on addition of any acid; if urine is cold and acid in reaction, sediment, if present, may be urates, but is not phosphates; if urine is alkaline, they are normal phosphates.
”
Source: Gutenberg

Albert Smith,  The Marchioness of Brinvilliers… (1886)

“ Then dropping some colourless fluid into them, one after the other, a precipitate fell down in all, in clouds of the brightest tints, but each different.
‘See how completely these dull minerals do my bidding,’ he exclaimed. ‘To you the potion offers no trace by which its nature could be told; to me there is not an atom suspended in it, in its invisible but imperishable form, which cannot be reproduced before our eyes.
”
Source: Gutenberg

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