A calibration standard containing of a light-absorbing species yields an absorbance…

CHEMISTRY · Subjective · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A calibration standard containing

0.0400\,\text{M}

of a light-absorbing species yields an absorbance of

0.500\pm0.010

in a

1.00\,\text{cm}

cuvette at

\lambda_{\max}

. An unknown solution of the same species measured in the same cuvette shows an absorbance of

0.620\pm0.012

. Calculate the concentration of the unknown solution and its absolute uncertainty, reporting the result in the form

(\text{value}\,\pm\,\text{uncertainty})\,\text{M}

to the appropriate number of significant figures.