For a particular analyte

PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

For a particular analyte, a calibration line has been determined as A=(1.52±0.05) c+(0.010±0.003),A = (1.52 \pm 0.05)\,c + (0.010 \pm 0.003), where AA is absorbance and cc is concentration in mM. An unknown solution gives an absorbance of 0.678±0.0050.678 \pm 0.005. Assuming uncertainties are independent and propagated by standard error analysis, which of the following best states the concentration of the unknown with its combined standard uncertainty? (a) (0.439±0.004)(0.439 \pm 0.004) mM (b) (0.439±0.015)(0.439 \pm 0.015) mM (c) (0.453±0.015)(0.453 \pm 0.015) mM (d) (0.669±0.015)(0.669 \pm 0.015) mM

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