Understanding Oxidizing Strengths in Redox Reactions

Lab 4 –Understanding Oxidizing Strengths in Redox Reactions– Lab Report CHM 2045L -Dr. Yavuz Petrowski The statement is: “I certify that this is my own work and I understand that if I am found to be in violation of the honor code, I will be subject to the highest penalty”. INITIAL: Name: Chrysie Vavick Znumber: 23779559 PRELAB: Background: Please complete the following sections. Purpose of the experiment: In your own words, the purpose of the experiment including a brief description of the lab and the reason for doing the experiment (what we are trying to determine and how we will go about determining it). Explain the concepts we are investigating; explain why and how they are useful, how those concepts apply to the experiment; show relevant equations if you need to. The purpose of this experiment is to work with redox reactions. Where we will be testing how these systems react when they are with an oxidizing and reducing agent. This will be determined by recording observations and what I have learned about redox reactions. With this I will be identifying the oxidizing and reducing agents which will allow me to determine if a redox reaction will occur at the end of each system/reaction. In this experiment we will be mixing multiple chemicals to see which reaction we will be getting. By aslo recording the measurements and the observations to decide whether a reaction happened, what type, and what changed. Flow Chart: Complete experimental procedure for this experiment by using information provided in the power point and 360 experimental video in a flow diagram format. A flow chart indicates the procedure of how experiment is performed. The flow chart must be written in the correct flow chart format (box and arrow). Handwritten flow charts are not accepted. See the example of the flow chart in canvas module. Waste Collection: Type out the chemicals used in this experiment, and their hazards if applicable, and any other safety concerns associated with this experiment. You can search for the Materials Safety Data Sheet document on the internet to list hazards and safety concerns. You can add an extra row if you need extra space. Chemicals Safety Hazard FeCl3 can cause irritation to skin and eyes NaHSO3 if inhaled can cause irritation to nose and throat NaOCl can cause skin and eye irritation HNO3 can cause eye, skin and throat irritation Kl can cause skin and eye irritation KBr can cause nausea and vomiting HCI ca burn and is highly flammable KMnO4 can cause and skin irritation DATA ANALYSIS Handwritten lab reports are not accepted SYSTEM #1: 2FeCl3 + 2KI ? 2FeCl2 + 2KCl + I2 For System 1 reaction, record your observations below. Did a redox reaction occur? Explain what your observations indicate about the redox reaction. If a reaction occurred complete questions 3-7. A reddox reaction did occur. FeCl3 was reduced to FeCl2. when the starch was added it changed color indicating I2 was formed. Which atom is oxidized, and what are its initial and final oxidation numbers? Which atom is reduced, and what are its initial and final oxidation numbers? Write the half equation for the oxidation reaction. KI^-1? 12^0 +e- Write the half equation for the reduction reaction. FeCl3^+3 +e ?Fe Cl2^+2 What other ions are in solution, and what are their roles? There are other spectator ions Cl- and K+ there roles are to provide neutral electrical conductivity. SYSTEM 2: 2MnO4 - + H + + 5HSO3 - ? 2Mn 2+ + 5 SO4 2- +3H2O Record your observations below. Did a redox reaction occur? Explain what your observations indicate about the redox reaction. If a reaction occurred complete questions 10-16. Which atom is oxidized, and what are its initial and final oxidation numbers? as its oxidation number. Which atom is reduced, and what are its initial and final oxidation numbers? Magnesium and its final oxidation number was as its initial +7 to its final +2 as its oxidation number. Which substance (not atom) is being oxidized? Which substance (not atom) is being reduced? Write the half equation for the oxidation reaction. Write the half equation for the reduction reaction. 2MNO4^- ?2MN ^2+ After the reaction is complete, what other ions are in solution and what are their roles? SYSTEM 3: OCl - + 2Br - + H2O ? Cl - + Br2 + 2OHRecord your observations below. Has a light yellow color, didn't have change colors Based on your observations, did a redox reaction occur? Explain what your observations indicate about the redox reaction. If a reaction occurred complete questions 19-25. The solution changed from clear to yellow, this reaction happened when Br2 was added which indicates it was a reaction. Which atom is oxidized, and what are its initial and final oxidation numbers? Br was oxidized from its initial 1 to its final 0. Which atom is reduced, and what are its initial and final oxidation numbers? Cl was reduced from its initial +1 to its final -1 Which substance (not atom) is being oxidized? Which substance (not atom) is being reduced? Write the half equation for the oxidation reaction. 2Br- ?Br2 +2e Write the half equation for the reduction reaction. OCl- +H2O1 + 2e ? Cl- + 2OHWhat other ions are in solution and what are their roles? SYSTEM 4: Reaction of acids with metals Is there any chemical reaction between Zinc metal or powder and 1.0 M HCl? If there is, write balanced chemical equation for these reactions. Record your observations for the reaction of zinc metal and acid below. 28. Record your observations for the reaction of copper metal and acid below. No reaction seen CONSIDERATION FOR DISCUSSION & CONCLUSION As you write your discussion and conclusion paragraphs for the discussion assay, here are some tips and questions you should answer. These are in addition to the "Guidelines for a good discussion and conclusion" document in the introduction module. List five types of chemical reactions. What is the proof of chemical reactions? Explain according to the experimental results. Be specific. What are the common properties of oxidation and reduction reactions? Explain one of the systems in which you observed oxidation and reduction reactions. How did you determine if it is an oxidation and reduction reaction? What are spectator ions? Did you include your spectator ions in molecular and complete ionic equations? In which cases where spectator ions are not included in chemical equations? In system 4. Did both metals react with HCl? If it did not explain the reason DISCUSSION & CONCLUSION ASSAY