Question

Three unknown solutions were prepared by pipetting 15.00 mL of an unknown nickel solution into a 200.00 mL volumetric flask and diluting to the mark. Then three samples were prepared from this dilute unknown solution by pipetting 5.00 mL of the dilute solution into a 25.00 mL flask, to which the reagents were added then it was diluted to the mark. UV Spectroscopy analyzed the resulting solutions and the unknown absorbance value were converted to concentration by means of a calibration curve, Table 4-1. Fill in the diagram with appropriate volumes. Determine the concentration of the original nickel solution, in ppm Ni, from each of the three unknown solutions and an average. Included appropriate error calculations. Show complete calculations using Trial 1 data. Present results for all trials and the average with uncertainties.
Unknown Trial
Trial 1 2.76885 ± 0.15252
Trial 2 3.23552 ± 0.16264
Trial 3 3.35263 ± 0.16485

Answer 1

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