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Updated: June 24, 2025
It is not necessary to clean the beaker completely or to wash the precipitate thoroughly at this point, as it is necessary to purify it by reprecipitation. On account of this slight solubility the volume of solutions should be kept as small as possible and the amount of wash-water limited to that absolutely required.
Much time may often be saved by washing precipitates by decantation, i.e., by pouring over them, while still in the original vessel, considerable volumes of wash-water and allowing them to settle. The supernatant, clear wash-water is then decanted through the filter, so far as practicable without disturbing the precipitate, and a new portion of wash-water is added.
The habit was a part of him, as real a thing in his constitution as the black ring in his fur. It was a very dirty habit, here in captivity, even if it went by the name of washing. Of course Mux could not be blamed for his soiled wash-water. That was my fault; only I couldn't be changing it every time he soaked up a fistful of earth in his endeavor to wash something to eat out of it.
He threw out the wash-water on the compost pile and went into the cabin, putting on his shirt and his belt. Then he passed through to the front porch, where his father was already eating at the table. The people of the Toon like to eat in the open. It was something they'd always done, just as they'd always like to eat together in the evenings.
If the silica were washed only with hot water, the solution of these chlorides remaining in the filter after the passage of the original filtrate would gradually become so dilute as to throw down basic salts within the pores of the filter, which would remain with the silica. To avoid this, an acid wash-water is used until the aluminium and iron are practically removed.
The active agent may be considered to be !nascent! hydrogen, and it must be borne in mind that the visible bubbles are produced by molecular hydrogen, which is without appreciable effect upon ferric iron. The rate at which the iron solution passes through the zinc should not exceed that prescribed, but the rate may be increased somewhat when the wash-water is added.
This good old custom prevailed in this ship, and under unusually favorable circumstances, for in the blazing tropical regions a removable zinc thing like a sugarshovel projects from the port to catch the wind and bring it in; this thing catches the wash-water and brings it in, too and in flooding abundance. Mrs.
I met here a telegraph operator named Stanton, who took me to his boarding-house, the most cheerless I have ever been in. Nobody got enough to eat; the bedclothes were too short and too thin; it was 28 degrees below zero, and the wash-water was frozen solid. The board was cheap, being only $1.50 per week.
It may be shown mathematically that the washing is most !rapidly! accomplished by filling the filter well to the top with wash-water each time, and allowing it to drain completely after each addition; but that when a precipitate is to be washed with the !least possible volume! of liquid the latter should be applied in repeated !small! quantities.
They were nice plump fellows, and when I saw the maniac soak one all stringy and tasteless I poured his wash-water out. Was he to be balked that way! No, no. He took oyster number two, flopped it into the empty tub, scoured it around on the muddy bottom, looked it over as carefully as he had done stringy number one, and swallowed sandy, muddy number two with just as much relish.
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