How To Approach A Lab Write-Up For Exp 12 ✓ Solved

How To Approach A Lab Write Up For Exp 12namedateof Experimenttitle

How to approach a lab write up for EXP 12 Name Date (of experiment) Title of experiment : (as listed in manual/handout) Purpose or Aim : This says exactly what the goal of the experiment is. It may consist of one or more parts. Based on what is stated in the procedure, you should have a very good idea as to what the point of the experiment is. Explicitly and briefly state all in this section. ( 3 points ) Examples: 1. To recrystallize an impure sample of benzoic acid; 2. To determine the melting point of salicylic acid

Introduction : This explains the theory behind the experiment. Give some general background as to what the experiment is about. Include definitions of any key concepts that are an important part of the experiment. ( 5 points ) This approach can be applied across all topics being covered.

Materials: List glassware, chemicals and equipment/instrumentation used in the experiment. ( 5 points )

Procedure: Write a step by step procedure of the experiment as outlined in the video. ( 5 points )

Results and calculations : Report results from experiment. Tables can be used, also show sample calculations. ( 13 points )

Substance Acetaminophen Aspirin Caffeine Excedrin Unknown Retention factor 0.........92 Identity of Unknown =

Discussion : Analyze the data you obtained in your experiment. Explain difference between the starting weight of the impure sulfanilamide and the pure sulfanilamide. (5 points )

Conclusion: (2 points )

Questions (1-6 pg points )

Sample Paper For Above instruction

Title: How To Approach A Laboratory Report for Experimental Chemistry Procedures

Introduction

Laboratory experiments are fundamental components of scientific education, providing practical experience in applying theoretical concepts. Writing a comprehensive lab report not only demonstrates understanding but also facilitates accurate communication of findings. This guide aims to delineate an effective approach to structuring a lab report, specifically for Experiment 12, covering essential sections such as purpose, introduction, materials, procedure, results, discussion, and conclusion.

Purpose or Aim

The primary goal of Experiment 12 is to accurately analyze and compare various substances through techniques such as chromatography or recrystallization, depending on the specific experiment outlined in the manual. For example, the aim may be to determine the retention factor of an unknown substance or to purify a compound like benzoic acid. Clearly articulating the purpose helps orient the reader and provides context for subsequent analysis.

Introduction

The introduction provides the theoretical foundation of the experiment, explaining principles such as chromatography, melting points, or recrystallization depending on the methods employed. It involves defining key concepts like retention factor, purity, or solubility, emphasizing their relevance to the experiment's goal. For instance, chromatography separates compounds based on differential affinities, leading to the calculation of retention factors, which are crucial for identifying unknown substances.

Materials

An accurate list of all glassware, chemicals, and equipment used is essential. Typical materials include chromatography plates, solvents like ethanol, glassware such as beakers, pipettes, balances, and specific reagents like salicylic acid or acetanilide, depending on the experiment's scope. This section ensures reproducibility and transparency in methodology.

Procedure

The procedure section should be a detailed, step-by-step account of how the experiment was conducted, summarized from the standard protocol but written in a clear narrative. Include specific measurements, timings, and sequence of steps, such as applying samples to a chromatography plate, developing the plate in a solvent chamber, and measuring retention factors. Following the outlined protocol ensures consistency and enables others to replicate the experiment accurately.

Results and Calculations

Results should be systematically presented, often in tables for clarity. For example, tabulate the substances tested with their respective retention factors. Include sample calculations demonstrating how data such as retention factors or melting points were derived. This transparency enhances credibility and allows for validation of the findings.

Discussion

This critical analysis interprets the results in the context of the experiment's objectives. For instance, explain differences between the initial weight of impure sulfur or sulfanilamide and the pure compound after purification. Discuss why certain substances exhibited specific retention factors, and how the data supports identification or purity assessment. Address any anomalies or sources of error, and relate findings to theoretical principles.

Conclusion

The conclusion summarizes the outcomes, confirming whether the experiment's objectives were achieved. For example, state if the unknown substance was successfully identified based on retention factors, or if purification was effective. Highlight key learnings and potential improvements.

Questions

Finally, answer all assigned questions to demonstrate comprehension and application of concepts learned during the experiment. Provide thorough, well-supported responses, incorporating data and theoretical knowledge.

References

  • Chang, R. (2010). General Chemistry: The Essential Concepts. Thomson Brooks/Cole.
  • Skoog, D. A., West, D. M., Holler, F. J., & Crouch, S. R. (2014). Principles of Instrumental Analysis. Brooks Cole.
  • McQuarrie, D. A., & Simon, J. D. (1997). Physical Chemistry: A Molecular Approach. University Science Books.
  • Singh, S., & Sharma, S. (2018). Laboratory Techniques in Organic Chemistry. New Delhi: CBS Publishers & Distributors.
  • Lehninger, A. L. (2008). Principles of Biochemistry. W. H. Freeman and Company.

By following this structured approach, students can prepare comprehensive, accurate, and well-organized lab reports that effectively communicate their experimental work and understanding.

References

  • Chang, R. (2010). General Chemistry: The Essential Concepts. Thomson Brooks/Cole.
  • Skoog, D. A., West, D. M., Holler, F. J., & Crouch, S. R. (2014). Principles of Instrumental Analysis. Brooks Cole.
  • McQuarrie, D. A., & Simon, J. D. (1997). Physical Chemistry: A Molecular Approach. University Science Books.
  • Singh, S., & Sharma, S. (2018). Laboratory Techniques in Organic Chemistry. New Delhi: CBS Publishers & Distributors.
  • Lehninger, A. L. (2008). Principles of Biochemistry. W. H. Freeman and Company.

References

  • Chang, R. (2010). General Chemistry: The Essential Concepts. Thomson Brooks/Cole.
  • Skoog, D. A., West, D. M., Holler, F. J., & Crouch, S. R. (2014). Principles of Instrumental Analysis. Brooks Cole.
  • McQuarrie, D. A., & Simon, J. D. (1997). Physical Chemistry: A Molecular Approach. University Science Books.
  • Singh, S., & Sharma, S. (2018). Laboratory Techniques in Organic Chemistry. New Delhi: CBS Publishers & Distributors.
  • Lehninger, A. L. (2008). Principles of Biochemistry. W. H. Freeman and Company.

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