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a sample has an absorbance of 0.189. When 5.00 mL of this sample was mixed with 125 ppm of Co2+, the resulting has an absorbance
a sample has an absorbance of 0.189. When 5.00 mL of this sample was mixed with 125 ppm of Co2+, the resulting has an absorbance of 0.446. Assuming that Beer's law applies, what is the concentration of cobalt in the sample in ppm?
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