CHEM 114 Qualitative Analysis of Electrolysis Reactions Lab Report

Question Description

I’m working on a chemistry report and need a sample draft to help me understand better.

Check out the attached documents.

The lab document is attached.The pictures for the experiment is also attached.

Please read them carefully.

This is an informal lab report for Experiment 3 Qualitative Analysis of Electrolysis Reactions.Please write neatly and legibly.

Part A: Preliminary observations

Table 1: Tests for Cu²⁺ and SO₃^-2

What I Did	Observations including before & after colors
Positive test for Cu²⁺: 0.020 M CuSO₄ + conc. NH₃
Negative test for Cu²⁺: Distilled water + conc. NH₃
Positive test for sulfite, SO₃^-2:0.1 M Na₂SO₃ + 0.2 mM KMnO₄
Negative test for sulfite, SO₃^-2:Distilled water + 0.2 mM KMnO₄

Part B: Qualitative Analysis of an Electrolytic Cell (Cu and Zn electrodes)

Table 2: Observations and measurements

What I Did	What I observed or measured	Conclusion(s) based on observation(s) or measurement(s)
Observed Cu cathode
Observed solution near Cu cathode
Sulfite (SO₃^2-) test
Massed Zn anode before experiment (g)
Massed Zn anode after experiment (g)
Observed Zn anode
Observed solution near Zn anode

Question 1: Identify which of the reduction half-reactions (1A, 1B, 1C) occurs at the cathode.Your explanation is in the conclusion column of Table 2, so no need to defend answer. ____________

Question 2: Explain why the reduction of Zn (s) was not included as a choice. Think electron configuration.

Question 3: Explain why the reduction of Cu (s) was not included as a choice. Think electron configuration.

Question 4: Identify which of the oxidation half-reactions (2A or 2B) occurs at the anode. Your explanation is in the conclusion column of Table 2, so no need to defend your answer. ____________

Question 5: Explain why the oxidation of Zn²⁺ (aq) was not included as a choice. Think electron configuration.

Question 6: Explain why the oxidation of SO₄^2-(aq) was not included as a choice. (Hint: Draw the Lewis structure of SO₄^2- to determine the oxidation number of the sulfur atom)

Part C: Qualitative Analysis of an Electrolytic Cell (two Cu electrodes)

Table 3: Observations

What I Did	What I observed	Conclusion(s) based on observation(s)
Observed color of solution before expt.
Observed color of solution after expt.
Observed Cu anode (right in diagram)
Observed solution near Cu anode (right in diagram)
Observed Cu cathode (left in diagram)
Observed solution near Cu cathode (left in diagram)
Flame test
Cu²⁺ test
Sulfite(SO₃^2-) test

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Question 7: Identify which of the oxidation half-reactions (3A or 3B) occurs at the anode.Your explanation is in the conclusion column of Table 3, so no need to defend your answer. ____________

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Question 8: Identify which of the reduction half-reactions (4A or 4B) occurs at the cathode.Your explanation is in the conclusion column of Table 3, so no need to defend your answer. __________

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Question 9a. Using the half-reactions in your answers to questions 1 & 4, write the net cell reaction for the Zn-Cu electrolytic cell. Show both half-reactions and the net call reaction in your answer. Be sure the # of electrons are the same in the 2 half-reactions before adding them.

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Question 9b. Using the half-reactions in your answers to questions 7 and 8, write the net cell reaction for the Cu-H⁺ electrolytic cell. Show both half-reactions and the net call reaction in your answer. Be sure the # of electrons are the same in the 2 half-reactions before adding them.

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