Type your question hereA 0.1390-g rock sample of unknown concentration was dissolved in HCl and diluted to 100.0 mL. Aliquots of 10.00 mL of this unknown solution were added to different volumes of a 2.08 ?g/mL Ca standard solution and diluted to 200.0 mL. Find the weight percent of Ca in the rock sample and the associated uncertainty from the x-intercept using the method of least squares. Unknown (mL) / Standard (ml) / Final Volume (ml) / Emission Intenisty 10 / 0 / 200 / 221 10 / 5 / 200 / 407 10 / 10 / 200 / 631 10 / 15 / 200 / 825 10 / 20 / 200 / 1015