Ordering red and ox agents Prachi Patel

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School

Purdue University *

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112

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Chemistry

Date

Dec 6, 2023

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docx

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Uploaded by prachi092603

Activities and Explorations: 10 points, Due Sunday April 23, 11:59 PM Ordering Reducing Agents Based Upon Lab Data (2023 version) Instructions: Upload your work on this page to Brightspace by typing or writing your responses and saving the file and uploading that file as a docx or pdf (not HEIC or pages). You can also take pictures of your written work and paste them in. Learning Objectives 18.1 Balancing Redox Reactions  Identify oxidized species, reduced species, oxidizing agent and reducing agent in a redox reaction  Explain observations about redox reactions in terms of spontaneity and strength of oxidizing or reducing agent  Order oxidizing or reducing agent in terms of strength using information from chemical observations Instructions: Complete the following problems. Show your work for credit, not simply the answers! Imagine that you carry out the following reactions in lab and have recorded the following observations. SnCl 2 (aq) + Ni(s)  NiCl 2 (aq) + Sn(s) Spontaneous Ni(NO 3 ) 2 (aq) + Fe(s)  Ni(s) + Fe(NO 3 ) 2 (aq) Spontaneous Zn(NO 3 ) 2 (aq) + Fe(s)  No reaction Non spontaneous 1. (2 pts.) For the first two reactions, identify what is oxidized and what is reduced. SnCl 2 is being reduced and Ni is being oxidized in the first reaction. Ni (NO 3 ) 2 is being reduced and Fe is being oxidized in the second reaction. 2. What role does the Cl − ion play in the first reaction? What role does the nitrate ion play in the second? The role of Cl − and nitrate ion is to be a spectator ion in first and second reaction. It just balances out the charge. It has no role, and it is a spectator ion because it does not get oxidized or reduced. 3. (2 pts.) Use the lab observations to order the oxidizing agents from weakest to strongest. Zn(NO 3 ) 2, Fe(NO 3 ) 2, Ni(NO 3 ) 2, NiCl 2, SnCl 2 4. (2 pts.) Use the lab observations to order the reducing agents from weakest to strongest. Sn, Ni, Fe, Zn

5. (2 pts.) Will SnCl 2 react with Zn (make a claim)? Justify your response using the lab observations. Yes, Fe and Zn(NO 3 ) 2 did not react and was unspontaneous so that means Zn and the Fe(NO 3 ) 2 react and it is spontaneous. If Zn and the Fe(NO 3 ) 2 react that means SnCl 2 will react with Zn because SnCl 2 is stronger oxidizing agent that Fe(NO 3 ) 2. 6. (2 pts.) Will Fe 2+ react with Sn (make a claim)? Justify your response using the lab observations. No, F e and Zn(NO 3 ) 2 did not react and was unspontaneous so that means Zn and the Fe(NO 3 ) 2 react and it is spontaneous. The Fe 2+ reacts with Zn, but it will not react with Sn because Zn is a way more stronger reducing agent than Sn.

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