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Beer-Lambert Law

AP Chemistry· difficulty 2/5

Using the same CuSO₄ calibration (ε = 4.0 M⁻¹cm⁻¹, b = 1.00 cm), an unknown gives A = 0.220.

A_unknown = 0.220 ε = 4.0 M⁻¹cm⁻¹ b = 1.00 cm

What is the [Cu²⁺] of the unknown?

  • A

    0.880 M

  • B

    0.110 M

  • C

    0.055 M

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  • D

    0.022 M

Explanation

c = A/(εb) = 0.220/(4.0·1.00) = 0.055 M.

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