All transltion metal lon solutlons waste regulations In this experiment. and was

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All transltion metal lon solutlons waste regulations In this experiment. and waste will be collected and disposed of by the Instructors and technical staft. Aclds and bases, e.g, H2S04 and NH3, are also corrosive and toxlc. Please use these solutions with caution. If you get any of these chemicals on your hands, wash well with cold water and report to your Instructor. ection A. Redox Reaction Investigations (1) To study a redox reaction involving copper and zinc species. (2) To describe and characterize some of the electrochemical properties of the reaction oals: perimental Steps:1. Clean your plastic reaction surface. 2. Obtain 4 pieces each of copper metal (Ca(s) and zinc metal Zn(s)) from Reagent Central. Use tweezers to transfer the metal pieces to the surface 3. Drop 2 drops of 1 M CuSO4 solution onto the top of a piece of Znes 4. Drop 2 drops of 1 M ZnSO4 solution onto the lop of a piece of Cush 5. Study each of the solution-metal interfaces with your hand lens bcou 2n tum s bla Cu 1m , Describe and record what you see Sa. NOTE: The discoloration of the Zngs) is due to the formation of finely divided Cus) at the zinc metal surface. The chemical reaction is a spontancous reaction in which an electron transfer is taking place, and it is called a reduction-oxidation, or redox, reaction: What half-reactions (one a reduction, the other an oxidation) can be written for this redox reaction? feduchon oridaton n

Explanation / Answer

first question) reduction half -reaction: Cu2+ +2e --->Cu(s)

Oxidation half rxn:

Zn(s) ---->Zn2+ +2e

1)2 electrons are being transferred from Zn to Cu

2)Reducing agent itself gets oxidized

Zn(s) is the reducing agent

Zn(s) ---->Zn2+ +2e (oxidation state from 0 to +2)

oxidizing agent itself gets reduced

Cu2+ is the oxidising agent

Cu2+ +2e --->Cu(s)(os from +2 to 0)

3)Heterogenous reaction as it takes place in more than one phase(aqueous or liquid phase and solid phase)

Cu2+(aq)+Zn(s)--->Cu(s)+Zn2+(aq)

4)Cu in redox reaction is pure copper ,while copper metal may have impurities in it so it looks different

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