Laboratory Practice; a Series of Experiments On the Fundamental Principles of Chemistry
Laboratory Practice; a Series of Experiments On the Fundamental Principles of Chemistry
Josiah Parsons Cooke
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Transfer to glass combustion tube connected with hydrogen genera- tor as in Ex. 53 (a). Interpose chloride-of-calci- xim tube between generator and combustion tube. Allow hydrogen to flow through the apparatus long enough to expel the air ; then heat the com- bustion tube, and continue until reduction is com- plete. Test gas evolved from outlet, which should be bent downwards. Preserve silver. Add a few drops of sulphuric acid to blue filtrate and evapo- rate (under hood) to get rid of the vola...tile acids ; dilute to 10 cubic centimetres and insert a strip of zinc. (1) What is the gas evolved during the reduction? What is its composition ? What must be the composition of the precipitate ? Does the formation of this precipitate con- form to any general principle — Ex. 14 (3). On what circum- stances does the separation of copper form silver in this ex- periment ? How can you be sure that the copper obtained came from the coin and not from any of the accessory ma- terials employed ? Ex.
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