How to calculate ppm of quinine in the sample
(You can use these situations as practice, but you are not required to solve the problem for this assignment. Justify your answer by describing the characteristics of the situation that lead to your determination. external calibration or standard addition.For each of the following situations, identify what type of calibration is being performed. Compare an experimental value to a reported value.Use a calibration curve to determine the amount of unknown analyte in a sample.Generate a calibration curve based on a set of external standards.
Describe under what circumstances an external calibration, standard addition, and internal standard are used in a quantitation.Identify when an internal standard is used in a quantitation.Identify a quantitation as an external calibration or standard addition.Calculate the concentration of dye in the unknown. A solution with an unknown concentration of dye yielded an absorbance of 0.884 ± 0.003 in the same cuvette for 3 replicate measurements.( A = abc, where A is absorbance, a is absorptivity, b is path length, and c is concentration) (answer = 2.91 (± 0.04) x 10 -3 ppm -1 cm -1) Determine the absorptivity of the dye in ppm -1 cm -1. The absorbance of the dye standard solution in part (2) was measured 7 times in a 1.00 ± 0.01 cm cuvette, yielding an average absorbance of 0.749 ± 0.002.Calculate the concentration of the standard solution in ppm (mg/L). A standard solution was prepared by dissolving 25.7 ± 0.1 mg of dye to a volume of 100.00 ± 0.08 mL in a volumetric flask.Determine the concentration of analyte in the unknown. A solution containing an unknown concentration of analyte yields a signal of 318. A 12.3 mM solution of analyte yields a signal of 489.
Use propagation of error to determine the relative error in a measurement.