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State three ways by which accuracy and precision can be checked in chemical experiments
Accepted Answer
Here are three ways to check accuracy and precision in chemical experiments:
1. Standard Addition Method: Adding known amounts of analyte to a sample and observing the change in signal. This method helps determine the accuracy of the analytical method by comparing the expected and measured concentrations.
2. Using Certified Reference Materials (CRMs): CRMs are materials with precisely known compositions. Analyzing a CRM using the same method as the experiment can assess the accuracy and precision of the technique.
3. Replicate Measurements: Conducting multiple measurements of the same sample under identical conditions. This provides insight into the precision of the experiment by assessing the variation in results. Calculating standard deviation and relative standard deviation can help quantify the precision.
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