Lab 5 – Limiting Reagent Study – Lab Report

Lab 5 –Limiting Reagent Study– 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” Name: Znumber: 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, and how those concepts apply to the experiment; show relevant equations if you need to. Flow Chart: Complete the experimental procedure for this experiment by using the information provided in the power point and 360 experimental videos in a flow diagram format. A flow chart indicates the procedure of how the 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 the canvas module. Waste Collection: Type out the chemicals used in this experiment, 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 Data Process Safety Hazard YOU MUST SHOW ALL YOUR CALCULATIONS TO RECEIVE CREDIT FOR THEM! Proper use of significant figures and units is part of the grading. PART I: FOR COCL2 TEST-TUBE TEST-TUBE TEST-TUBE TEST-TUBE TEST-TUBE TEST-TUBE #1 #2 #3 #4 #5 #6 Concentration 0.10 M The volume delivered (mL) Moles of CoCl2 For Na2CO3 Concentration Test-tube #1 Test-tube #2 Test-tube Test-tube #3 #4 0.10 M Test-tube #5 Test-tube #6 Test-tube #1 Test-tube #2 Test-tube #3 Test-tube #5 Test-tube #6 The volume delivered (mL) Moles of Na2CO3 Volume Measurements Height of precipitate formed (cm) Color of supernatant liquid observed. Color of precipitate observed. Test-tube #4 Calculations: Complete mol calculations for CoCl2 and Na2CO3 by using the information table given in the instructions file, and/or PowerPoint and 360 Lab video. Handwritten calculations are not acceptable. If the student submits a handwritten calculation, the assignment will be graded with a 4point deduction. Predictions of Limiting Reagent: This section can be completed while waiting for the precipitate to settle. Excess Co2+ or TESTTUBE #1 TESTTUBE #2 TESTTUBE #3 TESTTUBE #4 TESTTUBE #5 TESTTUBE #6 Test-tube #4 Test-tube #5 Test-tube #6 CO32- present? Moles of Co2+ in excess Moles of CO32- in excess Theoretical Yield of CoCO3 (moles) PART II: Verification of Limiting Reagent Observations of precipitate formation Reaction of supernatant liq. with Na3PO4 Reaction of Test-tube #1 Test-tube #2 Test-tube #3 Observations of precipitate Test-tube #1 Test-tube #2 Test-tube #3 Test-tube #4 Test-tube #5 Test-tube #6 formation supernatant liquid with BaCl2 Calculations: Complete mol calculations for excess CoCl 2 and Na2CO3 by using the information table given in the instructions file, and/or power point and 360 Lab video and include theoretical yield calculations. Handwritten calculations are not acceptable. If the student submits a handwritten calculation, the assignment will be graded with a 4-point deduction. 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.  What is limiting reagent and how important in practical applications? Were your predictions for which ion was in exceed verified by Part II of experiment? Explain.  How did you determine the point at which a reagent from part I becomes the limiting reagent for the reaction? Does the molar ratio have an effect on which reagent is the limiting reactant? Explain.  What is the difference between theoretical and percent yield? Why did you calculate the theoretical yield for your experiment? Would it be possible to calculate the experimental yield for your experiment and what information you would need? DISCUSSION & CONCLUSION ASSAY