Potassa caustic

To Obtain Soda. Pure soda and hydrate of soda (caustic soda) are obtained from carbonate of soda in a similar manner to the same preparations of potassa. Caustic soda is occasionally called sodic hydrate,... 

Synonyms caustic potash potassa potassium hydrate Uses... 

Hydrate of Phenyl, or Carbolic acicf.—Laubekt obtained from that portion of the nil of tar which boils between 300° and 400°, carbolic add, a compound which it has boon found convenient to represent as the hydrated oxide of a radical which has been termed phenyl. IV is obtained by agitating the cil with about twice its volume of aqua potassa, pouring off the watery portion, and saturating it by hydrochloric acid. The carbolic add separates in the form of a heavy oil, which may be purified by continuous distillation over a small quantity of caustic potassa. 

Subjoined are tho results of a scries of analyses performed upon tho same specimen of atmospheric air, previously freed from carbonic acid by caustic potassa, which show the delicacy of the indications of this in-... 

Action of Water on Lead.—When water which has been purified by distillation from pure caustic potassa, and kept out of contact with the atmosphere, is poured over clean sheets of lead, and so retained for a considerable period, no solution of the metal will be observed to have taken place, nor will the examination of the wator Indicate that any of the metal hasbeenfskenup. This... 

Morphin is often contaminated with narcotic, which may be entirely removed by ether, or the impure mass may be treated with very dilute acetic add which dissolves the former, leaving the latter untouched. To determine the purity—from nareotin—of any sample of morphin, it may be dissolved in hydrochloric acid, and treated with caustic potassa in excess, in which the morphia will entirely dissolve, while any narcotin present remains untouched. If a very small portion of morphia is placed in a watch-glass with, a little pure sulphuric aoid and au equal quantity of water, and if a particle of bichromate of potassa be added, a nickel green color appears, which changes, first to a copper green, and finally, to a dark dirty green. 

---