CH141 Lab Section
Report for Experiment 5 – Determining the Stoichiometry and Products of a Redox Reaction
Use complete sentences, use the proper number of digits and/or significant figures, and include units. Erase all the words in italics and type your answers/information into this template (your text/answers shouldn’t be in italics).
Introduction: 2-sentence maximum; state the scientific purpose of the experiment. Describe the method you will use, in a general sense.
Procedure : Give a brief description of the experimental procedure (a few sentences is sufficient, you do not need to write a full procedure). Reference the experiment handout on the CH141 website. List any changes from the written procedure on the handout (if any).
Results : Your results for Experiment 5 are the Excel data table that you produced during the laboratory period, including uncertainty values. This can be added as an attachment to your report. Make sure your table is properly labeled, and be sure to use correct significant figures. No other information is necessary in the results section for this report.
Present the balanced redox reaction most likely to represent the chemistry you observed.
In paragraph form, explain how you were able to identify the correct redox reaction that was taking place, and why your data support your conclusion.
Discuss the significance of your calculated accuracy and precision values.
Your discussion of accuracy and precision will naturally lead into why your calculated molar ratio is not 100% precise or accurate. Comment on one source of error that had a real impact on your precision , and one source of error that had a real impact on your accuracy . Make sure to choose only systematic or random errors, not human errors. Be clear about whether you are identifying random or systematic error, and give a concise explanation of how each error impacted your final results (did they make the results too high, too low, etc.).
Remember, all sources of error do not necessarily have a real impact on your final results. For example, the analytical balances read to 4 decimal places, and are uncertain to approximately ± 0.0002. If the error in your molar ratio is far greater than this level of precision, then other sources of error are the significant contributors to your final results.
Your Excel data table