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Perform a quantitative chemical analysis using a standard analytical technique: titration (acid-base, redox, complexometric, or precipitation), gravimetric analysis, or spectrophotometric quantification. The proof is the raw data (all trial results, not just concordant ones), calculations with error propagation, comparison to a reference or literature value with calculated percentage error, and a written discussion of systematic and random error sources. For students without lab access, the accessible alternative is a rigorous error propagation analysis using published reference analytical data from NIST Standard Reference Data or IUPAC certified reference values for a named compound — the mathematical analysis of precision, accuracy, and error sources demonstrates the same analytical reasoning as laboratory work. Reviewed by a chemist who examines the raw data for internal consistency and the error analysis for correct error propagation methodology.