By Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Achieve chemistry with CHEMICAL ideas within the LABORATORY, 10th version! transparent, straight forward, and direct, this lab guide will give you the instruments you want to effectively whole lab experiments and lab reviews. examining the information you become aware of within the lab classes is simple with the manual's a variety of strengthen research Assignments that provide you with additional perform with processing information via pattern questions.
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Additional resources for Chemical Principles in the Laboratory (10th Edition)
If necessary, complete the removal of the Cu with a drop or two of 6 M HCl added directly to the wire. Put the wire aside; it has done its duty. In the beaker you now have the metallic copper produced in the reaction, in a solution containing an aluminum salt. In the next step we will use a Buchner funnel to separate the copper from the solution. Weigh accurately a dry piece of filter paper that will fit in the Buchner funnel, and record its mass. Put the paper in the funnel, and apply light suction as you add a few mL of water to ensure a good seal.
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Stir the crystals for a minute or two to ensure that all of the CuSO4 impurity goes into solution. Cool the mixture in an ice bath. This will recrystallize most of the KNO3 that dissolved. After stirring for several minutes, check the temperature of the mixture with your thermometer. Continue cooling until the temperature is below 3°C. Then filter the slurry through an ice-cold Buchner funnel, transferring as much of the solid as possible to the funnel. Press the crystals dry with a piece of filter paper and continue to apply suction for a minute or so.