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Updated: May 14, 2025
Each part of the chlorides requires three parts by weight of the silver citrate to throw down the chlorine, thus: 3NaCl + Ag C H O = Na3.C H O +3AgCl. The silver chloride formed a dense insoluble precipitate, and the supernatant fluid was decanted and filtered through a rubber tube and handed round as a beverage. with less than half a grain of undecomposed chlorides.
When first mixed the contents of the tank, N, will have a creamy appearance, but when the superabundant lime has subsided the supernatant liquid will be a perfectly clear saturated solution of lime.
The precipitate formed is allowed to settle, 50 c.c. of the supernatant solution is removed with a pipette and transferred to a beaker; 50 c.c. of decinormal nitric acid and some water is added with sufficient cochineal tincture.
The supernatant fluid, which is sulphate of potash in solution, may now be carefully poured off, and its place filled with water; this operation should be repeated several times until the water which passes off is tasteless.
If you have much supernatant Liquor, you may parboil more Mushrooms next day, and put them to the first. If you have not gathered at once enough for a dressing, you may keep them all night in water to preserve them white, and gather more the next day, to joyn to them. Pare them, put them into a Pipkin, with so much Red or Claret Wine and water, ana, as will near reach to the top of the Pears.
Under this treatment the greater portion of the zinc that had been chemically dissolved by the potash is precipitated in the form of zinc hydrate, along with some carbonate. The liquid is now allowed to settle, and the clear supernatant solution is poured back again into the battery cells.
You see here I can pour off the supernatant liquid clear, leaving our silver and gelatine as a clot at the bottom of the vessel. Another action of chromic acid is, that it destroys the action of light on silver bromide, so that up to this point operations can be carried on in broad daylight.
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