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An unknown was prepared with the concentration of 0.000520 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1550.2 M–1. The expected absorbance and %T values for the diluted aspirin solution prepared by the student is
and , respectively.

  • Chemistry -

    A straight line is
    y = mx + b
    Since the line passes through the origin, b = 0 and the equation becomes y = mx.
    Since you normally plot absorbance on the y axis, and concn on the x axis, the equation becomes A = m*c or A = slope*c.
    You know the slope and you know c, calculate A. To fine %T remember that A = log 1/T or A = 100/%T.

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