Arsenic Acid
An acid formed by the combination of metallic arsenic with oxygen. It is sour, reddens litmus, and forms salts with the bases, which are termed ARSENIATES. By careful evaporation it may be obtained under the form of small grains, but usually has the consistence of syrup, being very deliquescent. must be attached to the rim with paste. A conc, formed with strong and thick paper, (cartridge paper), is then to be capped over the top of the pot, including the blotting paper; and this is also to be attached with paste and string. The apparatus, thus prepared, should then be placed on the sandbath, and exposed from 4 to 6 hours to a gentle heat. After this lapse of time, it may be removed from the sand-bath, inverted, and the string detached, when beautiful white needles, of a silky lustre, possessing the agreeable odor of benzoic acid, will be found in the paper cone. 3944. To Obtain Anhydrous Benzoic