Question #8c507

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Question #8c507

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Answer 1 · 2017-07-31T06:08:20

Rearrangement of Beer's law

Explanation:

Beer's law states that you can determine the absorbance (A) with three factors: molar absorptivity ( $ε$ $epsilon$ ), path length (b), and concentration (c). Absorbance has no units. Path length is usually 1 cm. The molar absorptivity is measured in $L \cdot m o l^{- 1} \cdot c m^{- 1}$ $L*mol^-1*cm^-1$ . Concentration is in $m o l \cdot L^{- 1}$ $mol*L^-1$ .

$A = ε b c$ $A=epsilonbc$

If you rearrange the equation, you can solve for concentration.

$c = \frac{A}{ε b}$ $c=A/(epsilonb)$

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Question #8c507

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