b) A drug analysis is performed with gas chromatography/mass spectrometry (GC/MS) and requires the use of reliable standards. The lab purchases a 1.0 ml commercial standard that is certified to contain the drug of interest at a concentration of 1.00 mg/ml with a reported uncertainty of 1.0 %. To prepare the stock solution for calibration, an analyst uses a syringe with an Uncertainty of 0.5% to transfer 250.0 L of commercials standard to a Class-A 250 ml volumetric flask with an uncertainty of 0.08 ml. Calculate the final concentration in ppb (3Marks) (2Marks) Calculate the propagated uncertainty Indicate the final concentration and uncertainty (1 Mark) i) ii) iii)