Proceedings of the American Academy of Arts And Sciences
Proceedings of the American Academy of Arts And Sciences
American Academy of Arts And Sciences
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No. 3, one thousandth. No. 4, one ten- thousandth. No. 5, one hundred-thousandth. No. 6 yielded no pre-» cipitate without concentration. Each succeeding precipitate in the se- ries, setting aside a slight allowance to be made on account of )M>lubil- ity, was one tenth as voluminous as the one above. ^^ Having prepared this scale of quantities, it is required to determine the amount of lead in a given diluted solution.. An experiment i$ made to ascertain if the quantity be large enough to give a... direct precipitate with sulphide of ammonium. This being decided in the negative, fifty cubic centimetres or grammes of water (corresponding with fifty parts of the scale of solutions) are carefully evaporated to dryness and ignit- ed in a small porcellain capsule (to expel any organic matter that may have been present), rnoLstened with nitric acid, and then warmed, with the addition of acetic acid and water, till the volume becomes ten cubic centimetres. A drop of acetate of potassa is then «dded, and then hy- drosulphuric acid gas transmitted through the solution.
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