Answer :

In a laboratory setting, especially in chemistry, precision is crucial to achieving accurate and reliable results. However, the necessity of weighing exactly 83 mg of trans-cinnamic acid depends on the context of the experiment.

Here are some considerations to understand whether exact weighing is necessary:

  1. Accuracy vs. Precision:

    • Accuracy refers to how close a measured value is to the true value. An accurate measurement of 83 mg would result in a value very close to 83 mg.
    • Precision refers to the consistency of repeated measurements. In some experimental contexts, being precise, up to a point, is more important than hitting the exact target weight.

  2. Significance of 83 mg:

    • If 83 mg is a critical stoichiometric amount necessary for a quantitative reaction or calculation, then weighing exactly 83 mg (or as close as possible) may be important to avoid substantial errors.
    • If the experiment is more qualitative—such as observing a color change or measuring solubility—slight deviations from 83 mg might be acceptable without impacting the outcomes significantly.

  3. Tolerance for Error:

    • Laboratories usually have an acceptable error margin. For small-scale reactions, slight deviations from 83 mg might fall within this error range and not substantially affect the results.
    • Consider the balance used. Analytical balances with higher precision allow for smaller margins of error, while less precise balances might introduce variability.

  4. Instructions and Protocol:

    • Always adhere to specific instructions or protocols. If the procedure emphasizes an exact amount, aim for precise measurements.

In conclusion, whether one needs to weigh exactly 83 mg depends on the context and purpose of the experiment. If in doubt, it's always a good practice to ask the instructor or refer to the specific guidelines of the experiment being conducted.

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