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14 12 The method developed in Problem 14 11 was used for the routine determination...

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14 12 The method developed in Problem 14 11 was used for the routine determination of iron in 25 0 ml aliquots of groundwater Express the concentration as ppm Fe in samples that yielded the accompanying absorbance data 1 00 cm cell Calculate the relative standard deviation of the result Repeat the calculation assuming the absorbance data are means of three measurements c 0 068 e 1 512 d 1 009 f 0 546 a 0 143 b 0 675

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