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9 July, 21:54

A concentrated solution of compound A in the same solvent was diluted from an initial volume of 2.00 mL to a fi nal volume of 25.00 mL and then had an absorbance of 0.733. What is the concentration of A in the concentrated solution?

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  1. 9 July, 22:59
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    The concentration of A in the concentrated solution is 0.05864

    Explanation:

    Given

    Volume 1 = V1 = 2.00mL

    Volume 2 = V2 = 25.00mL

    Absorbance 1 = A1 = ?

    Absorbance 2 = A2 = 0.733

    Beer's law states that the concentration of a chemical solution is directly proportional to its absorbance.

    i. e.

    V = kA where V = Volume (Concentration)

    A = Absorbance

    k = Constant

    Make k the subject of formula

    k = V/A

    V1/A1 = V2/A2

    Make A1 the subject of the formula

    A1 = V1 * A2/V2

    Substitute the values of V1, A2 and V2

    A1 = 2 * 0.733/25

    A1 = 0.05864

    So, the concentration of A in the concentrated solution is 0.05864
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