5. (10 points) Lead (Pb) in dry river sediment was quantified using the method of standard addition by extracting a known amount of sediment with 25 wt% HNO, at 35°C for 1 h, and filtering the extract for analysis using electrochemistry. A 1.00 mL portion of the filtered extract solutions of Pb were prepared by mixing 0.50-mL, aliquots of solution A with increasing was mixed with other reagents to bring the total volume to 5.00 mL (Solution A). Next, various volumes of 2.50 ppm Pb as listed in the table below, and bringing the total volume of each plotted against the volume of Pb added, and the equation of the line for the given set of data solution to 5.00 mL. The measured signals for each of these solutions (see table below) were was determined to be: y = 49.52x+1.094 Pb added (mL) Signal (arbitrary units) | 0 1.12 0.025 1.68 0.050 2.32 0.075 2.97 What is the concentration of lead (in ppm) in solution A?. X What is this concentration expressed in micrograms per liter? X 6.575 0.050 0.5 1.25 1.50 When yo 1.75 2.00 22.50. 2.75 3.0. x= .022