Which of the following sentences is most appropriate for inclusion in a formal lab report for a CHM113 laboratory experiment?

• A. The solution turned blue after adding copper(II) sulfate, indicating the formation of a complex.
• B. We messed up a bit but still got some results.
• C. The stuff in the beaker changed, so something happened.
• D. I think the experiment worked because the color looked cool.

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the purpose of a formal lab report, which is to communicate scientific observations and results clearly, objectively, and precisely.
2. Step 2: Identify that appropriate language in a lab report should be formal, avoid slang or casual expressions, and describe observations and conclusions based on evidence.
3. Step 3: Review each sentence option and evaluate its tone and clarity. Sentences like 'We messed up a bit...' or 'The stuff in the beaker changed...' are informal and vague, which are not suitable for a formal report.
4. Step 4: Recognize that the sentence 'The solution turned blue after adding copper(II) sulfate, indicating the formation of a complex.' uses precise chemical terminology, describes a clear observation, and links it to a scientific conclusion.
5. Step 5: Conclude that the most appropriate sentence for a formal lab report is the one that clearly and objectively states the observed change and its chemical significance.