At a particular wavelength

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

At a particular wavelength, a spectrophotometer provides reliable readings only when absorbance values lie between

0.100

and

1.000

. For a solute with a molar absorptivity of

1.20\times10^{4}\,\text{L\,mol}^{-1}\text{\,cm}^{-1}

measured in a

1.00\,\text{cm}

cuvette, what concentration range (in mol\,

\text{L}^{-1}

) will keep the absorbance within the instrument’s reliable range? (a)

1.2\times10^{-6}\le c \le 1.2\times10^{-5}

(b)

1.2\times10^{-5}\le c \le 1.2\times10^{-4}

(c)

8.3\times10^{-6}\le c \le 8.3\times10^{-5}

(d)

8.3\times10^{-5}\le c \le 8.3\times10^{-4}