8. Aluminum (as Al3+) is often found in industrial wastewater and must be removed, to prevent environmental pollution. Aluminum is measured spectroscopically using xylenol orange. Xylenol orange reacts with Al3+ to form a colored complex that adsorbs light at 536 nm. A standard addition analysis is provided below. The plot was created by mixing 2 mL of ImM xylenol orange with 10 mL of a pH 3.4 buffer and with 5.00 mL of sample and then 0.00 to 3.00 mL of a 5.68 mg/L aluminum standard (seven different solution). The solutions are briefly heated in a boiling water bath, cooled, and then diluted to 25.00 mL. The absorbances of the solutions are then measured (see plot below). What is the concentration of aluminum (26.98 g/mol) in the sample in units of mg/L and molarity? Standard Addition 0.8 0.7 y = 0.1635x +0.2014 R2 = 0.9927 0.6 0.5 AU(536nm) 0.4 0.3 0.2 0.1 0 0 0.5 1 1.5 2 2.5 3 3.5 V(mL)