GENERAL DIRECTIONS Precipitation; Funnels and Filters; Filtration and Washing of Precipitates; Desiccators; Crucibles and their Preparation for Use; Ignition of Precipitates DETERMINATION OF CHLORINE IN SODIUM CHLORIDE DETERMINATION OF IRON AND OF SULPHUR IN FERROUS AMMONIUM SULPHATE DETERMINATION OF SULPHUR IN BARIUM SULPHATE DETERMINATION OF PHOSPHORIC ANHYDRIDE IN APATITE ANALYSIS OF LIMESTONE Determination of Moisture; Insoluble Matter and Silica; Ferric Oxide and Alumina; Calcium; Magnesium; Carbon Dioxide ANALYSIS OF BRASS Electrolytic Separations; Determination of Lead, Copper, Iron and Zinc. DETERMINATION OF SILICA IN SILICATES PART IV. STOICHIOMETRY SOLUTIONS OF TYPICAL PROBLEMS PROBLEMS APPENDIX ELECTROLYTIC DISSOCIATION THEORY FOLDING OF A FILTER PAPER SAMPLE NOTEBOOK PAGES STRENGTH OF REAGENTS DENSITIES AND VOLUMES OF WATER CORRECTIONS FOR CHANGE OF TEMPERATURE OF STANDARD SOLUTIONS ATOMIC WEIGHTS LOGARITHM TABLES QUANTITATIVE CHEMICAL ANALYSIS PART I INTRODUCTION SUBDIVISIONS OF ANALYTICAL CHEMISTRY A complete chemical analysis of a body of unknown composition involves the recognition of its component parts by the methods of !qualitative analysis!, and the determination of the proportions in which these components are present by the processes of !quantitative analysis!. A preliminary qualitative examination is generally indispensable, if intelligent and proper provisions are to be made for the separation of the various constituents under such conditions as will insure accurate quantitative estimations. It is assumed that the operations of qualitative analysis are familiar to the student, who will find that the reactions made use of in quantitative processes are frequently the same as those employed in qualitative analyses with respect to both precipitation and systematic separation from interfering substances; but it should be noted that the conditions must now be regulated with greater care, and in such a manner as to insure the most complete separation possible. For example, in the qualitative detection of sulphates by precipitation as barium sulphate from acid solution it is not necessary, in most instances, to take into account the solubility of the sulphate in hydrochloric acid, while in the quantitative determination of sulphates by this reaction this solubility becomes an important consideration. The operations of qualitative analysis are, therefore, the more accurate the nearer they are made to conform to quantitative conditions.