An introduction to practical chemistry : including analysis . ledwater, and test the solutionas before, with nitrate ofsilver and chloride of precipitates, if any,will be less dense than inthe previous examination,showing that a partial puri-fication has been effected. 80. The distilled nitricacid may now be tested forimpurities, but before thetest liquids are applied aportion should be diluted with four or five times itsbulk of distilled water, since the chloride of barium isitself insoluble in strong nitric acid, and would conse-quently cause a precipitate, even though no sulphuri
An introduction to practical chemistry : including analysis . ledwater, and test the solutionas before, with nitrate ofsilver and chloride of precipitates, if any,will be less dense than inthe previous examination,showing that a partial puri-fication has been effected. 80. The distilled nitricacid may now be tested forimpurities, but before thetest liquids are applied aportion should be diluted with four or five times itsbulk of distilled water, since the chloride of barium isitself insoluble in strong nitric acid, and would conse-quently cause a precipitate, even though no sulphuricacid were present. A portion may then be tested forsulphates and chlorides with chloride of barium andnitrate of silver (403, 429). 81. If the distilled acid is found to contain sulphuricor hydrochloric acids, it may be purified from them byadding a solution of nitrate of silver as long as any pre-cipitate is produced, and re-distilling; when thoseacids will remain behind in combination with the oxideof silver. HCl+HO,S03+2(AgO,N05)^AgC\+AgO,SOs+2(^06).. 48 GLASS-WORKING. CHAPTER IV. GLASS-WORKING. 82. The most convenient form of apparatus for work-ing glass on the small scale, is the water blowpipe,which consists of an upright box, about fifteen incheshigh, of the form represented in Figure 25. It is usuallymade of zinc or copper, and is divided into two com-partments by the plate a, which passes down to withinabout half an inch of the bottom, thus leaving a com-munication open betweenFg 25. the two. The lower end of the tube b is closed by avalve opening outwards, toprevent the escape of air inthat direction: thebox shouldbe filled about half, full ofwater, and when used, airis blown through the tubeb. The pressure thus oc-casioned in the compart-ment e, forces a portion ofthe water into the next divi-sion d, where it rises to ahigher level than in c, and by its superior pressure forcesa stream of air through the fine aperture at the extre-mity of the tube e, as long as i
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