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A 0.1860 g rock sample containing an unknown amount of Ca was dissolved in HCI and diluted to 100.0 mL. Aliquots of 5.00 mL from this solution were added to different volumes of a 2.08 µg/ml. Ca standard solution and diluted to 200.0 mL. The emission intensity of these solutions was measured using atomic emission spectroscopy. The results are shown in the table. Unknown volume (mL) Standard volume (mL) Final volume (mL) Emission Intensity 200.0 200.0 200.0 200.0 200.0 5.00 227.0 5.00 413.0 5.00 637.0 5.00 831.0 5.00 1021.0 Find the weight percent of Ca in the rock sample and its uncertainty using the method of standard additions. weight percent: 8.27 x10-5 Incorrect 0.00 5.00 10.00 15.00 20.00 % Ca .03 Incorrect

A 0.1860 g rock sample containing an unknown amount of Ca was dissolved in HCI and diluted to 100.0 mL. Aliquots of 5.00 mL from this solution were added to different volumes of a 2.08 µg/ml. Ca standard solution and diluted to 200.0 mL. The emission intensity of these solutions was measured using atomic emission spectroscopy. The results are shown in the table. Unknown volume (mL) Standard volume (mL) Final volume (mL) Emission Intensity 200.0 200.0 200.0 200.0 200.0 5.00 227.0 5.00 413.0 5.00 637.0 5.00 831.0 5.00 1021.0 Find the weight percent of Ca in the rock sample and its uncertainty using the method of standard additions. weight percent: 8.27 x10-5 Incorrect 0.00 5.00 10.00 15.00 20.00 % Ca .03 Incorrect

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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A 0.1860 g rock sample containing an unknown amount of Ca was dissolved in HCI and diluted to 100.0 mL. Aliquots of 5.00 mL from this solution were added to different volumes of a 2.08 µg/mL. Ca standard solution and diluted to 200.0 mL. The emission intensity of these solutions was measured using atomic emission spectroscopy. The results are shown in the table. Unknown volume (mL) Standard volume (mL) Final volume (mL) Emission Intensity 0.00 200.0 5.00 200.0 10.00 200.0 15.00 200.0 20.00 200.0 Find the weight percent of Ca in the rock sample and its uncertainty using the method of standard additions. weight percent: 5.00 5.00 5.00 5.00 5.00 8.27 x10-5 Incorrect % Ca .03 Incorrect 227.0 413.0 637.0 831.01 1021.0
Transcribed Image Text:A 0.1860 g rock sample containing an unknown amount of Ca was dissolved in HCI and diluted to 100.0 mL. Aliquots of 5.00 mL from this solution were added to different volumes of a 2.08 µg/mL. Ca standard solution and diluted to 200.0 mL. The emission intensity of these solutions was measured using atomic emission spectroscopy. The results are shown in the table. Unknown volume (mL) Standard volume (mL) Final volume (mL) Emission Intensity 0.00 200.0 5.00 200.0 10.00 200.0 15.00 200.0 20.00 200.0 Find the weight percent of Ca in the rock sample and its uncertainty using the method of standard additions. weight percent: 5.00 5.00 5.00 5.00 5.00 8.27 x10-5 Incorrect % Ca .03 Incorrect 227.0 413.0 637.0 831.01 1021.0
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