Galvanic Cell Lab -do at least the hypotheses before lesson 6 In this online lab
ID: 704412 • Letter: G
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Galvanic Cell Lab -do at least the hypotheses before lesson 6 In this online lab simulation you will have the opportunity to test the cells that can be made with the various electrodes and electrolyte solutions. Some of the post lab questions are to be answered after you have completed lesson 7. Materials Galvanic cell comprised of two beakers, a salt bridge, wires and a volt meter Electrodes: zinc, silver, copper and hydrogen Electrolyte solutions: silver nitrate, copper (I) nitrate, zinc nitrate and hydrochloric acid Part 1: Pre-Lab Questions 1. Write a hypothesis about how specific electrodes and electrolytes must be combined to make a functioning cell (ex. the identiy of the anode and its electrolyte). 2. Write a hypothesis about how specific anodes and cathodes must be combined to make a functioning cell. 3. Write a hypothesis about which combination of electrodes will result in the greatest positive voltage. As this is a galvanic cell, these are positive voltages. REMEMBER: a hypothesis is a guess based on previous knowledge. Try using the format IF...THEN...BECAUSE to appropriately formulate your hypotheses. You must include the reason why you think what will happen will happen. You may base it on previous chemistry (or physics) courses etc. 4. Given the materials above, write the half reaction for each electrode, including its Ecell value.Explanation / Answer
4. The half cell reactions as well as their Ecell values
Zn2+(ox)+ 2e_ -----> Zn(red) E0= --0.763V
Cu2+ (ox)+ 2e ----->Cu(red) E0= +0.337V
Ag+ + e -----> Ag E0=+0.799V
2H+ + 2e -------> H2 E0= 0.0V
3. If we want to get the greatest positive voltage then we have to choose the metals that are the most apart in the electrochemical series that is here Zinc and Silver .
2. Regardless of the polarity,the electrode where oxidation takes place is anode and reduction takes place is cathode. Example an electochemical cell connected by a salt bridge ,one beaker is Zinc metal in a Zn(NO3)2 sol and in another Silver in Silver nitrate sol .The two metals connected by a wire and current flows The salt bridge supplies a return path so that the solution remains neutral . the redox of th Zn electrode is -0.763V and that of Ag is +0.799V. this means that elctrons will flow from the zinc to silver electrode. The zinc is oxidised to Zn2+ and the siver ions in electrolyte are reduced.
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