(Solved): 1. Potassium is determined by flame emission spectrometry using lithium as an internal standard. T ...

1. Potassium is determined by flame emission spectrometry using lithium as an internal standard. The following data were obtained for standard potassium solutions and unknown sample containing a constant amount of LiCl as the internal standard. Concentration of K, ppm 1.0 2.0 5.0 7.5 10.0 20.0 Unknown K emission intensity 10 15.3 34.7 65.2 95.8 110.2 45.3 Li emission intensity 10 7.5 6.8 8.5 10 5.8 9.1 Calculate the concentration of K in the unknown sample. Show how a quantitative determination for the species is done using the calibration curve.