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Sample of unknown concentration was dissolved in hcl

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A 0.1550 g rock sample of unknown concentration was dissolved in HCl and diluted to 100.0mL. Aliquots of 15.00 ml of this unknown solution were added to different volumes of a 2.08 micrograms/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 Intensity
15.0 0.00 200.0 214.0
15.0 5.00 200.0 400.0
15.0 10.0 200.0 624.0
15.0 15.0 200.0 818.0
15.0 20.0 200.0 1008.0

Reference no: EM13519442

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