Beer-Lambert Law

AP Chemistry· difficulty 3/5

Five standards of CuSO₄ at 600 nm give absorbance values.

[Cu²⁺] (M) A 0.020 0.080 0.040 0.160 0.060 0.240 0.080 0.320

What is the molar absorptivity ε (1.00 cm path)?

  • A

    2.0 M⁻¹cm⁻¹

  • B

    0.25 M⁻¹cm⁻¹

  • C

    4.0 M⁻¹cm⁻¹

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  • D

    8.0 M⁻¹cm⁻¹

Explanation

Slope (A/c) = 0.080/0.020 = 4.0 M⁻¹cm⁻¹ (constant), so ε = 4.0 M⁻¹cm⁻¹.

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