For the AAS method, a series of standards of known concentration was prepared by diluting a stock solution of ions. The instrument was zeroed with deionized water and the absorbance of each standard was recorded.
(i) Draw the line of best fit for these calibration points on the graph.
(ii) A sample of the rinse water gave an absorbance of 0.065. Determine, in ppm, the concentration of in the sample.
(iii) To prepare the 6.00 ppm standard, 2.50 of the stock solution was made up to 50.00 with deionized water. Calculate, in ppm, the concentration of the stock solution.