Experiment 6 Reactions of a Copper cycle

Experiment 6 Reactions of a Copper cycle - 1 Experiment 6...

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Unformatted text preview: 1 Experiment 6: The Reactions of a Copper Cycle PURPOSE AND LEARNING OBJECTIVES During the process of this experiment, you will observe and record the chemical and physical changes that occur when metallic copper is carried through a series of chemical reactions that produce a number of different copper compounds before the copper is restored to its original metallic state. You will become familiar with basic laboratory procedures employed for product separation and purification and with the concept of percent recovery. You will balance and classify the different reactions involved in the cycle according to their type. You will be expected to recognize and write the formula unit, total ionic and net ionic equation for the precipitation and acid- base reactions in the cycle. CONCEPTS You should be familiar with the following concepts prior to the lab: 1) The Law of Conservation of Mass. 2) Percent Composition 3) Writing and balancing chemical equations. 4) Molarity and solution stoichiometry. 5) Precipitation Reactions 6) Acid/Base Reactions PRINCIPLES Often it is necessary that chemists perform a series of chemical reactions in order to acquire a product which is unobtainable from a single chemical reaction step. During these reaction processes, the product of a reaction in one step is used as a reactant in a subsequent step in the reaction series. Just as chemists characterize matter based on properties, they also use a system for grouping chemical reactions into classes. The general classification system used by most chemists is to divide the chemical reactions into types. Each one of the five reactions of the copper cycle has a reaction that can be classified as one of four types: precipitation reactions, acid-base reactions, oxidation-reduction and decomposition reactions. Copper belongs to a group of elements called the transition metals. Like many transition metal elements, copper is brilliantly colored as a metal and has distinctive colors as copper compounds. During this experiment, you will produce and observe some colorful aqueous copper (II) complexes and classify each reaction according to its reaction type. You will begin with a sample of copper metal and will carry it through a cycle of reactions where you begin and end with solid copper metal. In the final step of your procedure, you will recover, weigh and calculate the percent recovery of your original sample of copper. REACTION TYPES I. Precipitation reactions occur when two compounds dissolved in aqueous solutions react to produce an insoluble solid. The driving force for these types of reactions is the strong attraction between cations (positive ions) and 2 anions (negative ions) in the solution. The overall result of this type of reaction is the removal of ions from the solution by the formation of a precipitate (ppt)....
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This note was uploaded on 03/19/2011 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas.

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Experiment 6 Reactions of a Copper cycle - 1 Experiment 6...

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