Assume the molar absorptivity (ε) for CoCl42- at 700 nm is 409.7 M-1 cm-1. If d, the cell path length, is equal to 1.48 cm for the cuvettes being used, and if the measured absorbance (A) at 700 nm is 1.147, what is [CoCl42-]?

1.89 × 10⁻³ M

Explanation:

In a UV Visible Spectrometer, we can determine the concentration of a species using Beer-Lambert law.

A = ε × l × c

where,

We can find  [CoCl₄²⁻] from this expression.

A = ε × l × c

c = A / ε × l

c = 1.147 / 409.7 M⁻¹ cm⁻¹ × 1.48 cm

c = 1.89 × 10⁻³ M

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