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The amount of lead in a aqueous sample is determined by atomic absorption spectrometry. Two standard solutions are prepared and used to make a calibration curve, and then the absorbance of the sample is measured. the results are given below. Determine the concentration of lead in the solution.

 

[Pb]ppm       Absorbance

1.13              .1837

3.74               .6183

unknown         .2836

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