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The sodium in a series of cement samples was determined by flame emission spectroscopy. The flame photometer was calibrated with a series of NaCl standards that contained sodium equivalent to 0, 20.0, 40.0, 60.0, and 80.0 µg Na2O per mL. The instrument readings R for these solutions were 3.1, 21.5, 40.9, 57.1, and 77. 3. a. Plot the data using a spreadsheet. b. Obtain a least-squares equation for the data. c. Calculate the statistics for the line in (b). (d) d. The following data were obtained for replicate 1.000-g samples of cement that were dissolved in HCl and diluted to 100.0 mL after neutralization. Emission Reading Blank Sample A Sample B Sample C Replication 1 5.1 28.6 40.7 73.1 Replication 2 Replication 3 4.9 28.9 4.8 28.2 41.2 72.1 40.2 Spilled Calculate the percentage of Na2O in each sample. What are the absolute and relative standard deviations for the average of each determination?

The sodium in a series of cement samples was determined by flame emission spectroscopy. The flame photometer was calibrated with a series of NaCl standards that contained sodium equivalent to 0, 20.0, 40.0, 60.0, and 80.0 µg Na2O per mL. The instrument readings R for these solutions were 3.1, 21.5, 40.9, 57.1, and 77. 3. a. Plot the data using a spreadsheet. b. Obtain a least-squares equation for the data. c. Calculate the statistics for the line in (b). (d) d. The following data were obtained for replicate 1.000-g samples of cement that were dissolved in HCl and diluted to 100.0 mL after neutralization. Emission Reading Blank Sample A Sample B Sample C Replication 1 5.1 28.6 40.7 73.1 Replication 2 Replication 3 4.9 28.9 4.8 28.2 41.2 72.1 40.2 Spilled Calculate the percentage of Na2O in each sample. What are the absolute and relative standard deviations for the average of each determination?

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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The sodium in a series of cement samples was determined by flame emission spectroscopy. The flame photometer was calibrated with a series of NaCl standards that contained sodium equivalent to 0, 20.0, 40.0, 60.0, and 80.0 µg Na2O per mL. The instrument readings R for these solutions were 3.1, 21.5, 40.9, 57.1, and 77. 3. a. Plot the data using a spreadsheet. b. Obtain a least-squares equation for the data. c. Calculate the statistics for the line in (b). (d) d. The following data were obtained for replicate 1.000-g samples of cement that were dissolved in HCl and diluted to 100.0 mL after neutralization. Emission Reading Blank Sample A Sample B Sample C Replication 1 5.1 28.6 40.7 73.1 Replication 2 Replication 3 4.9 28.9 4.8 28.2 41.2 72.1 40.2 Spilled Calculate the percentage of Na2O in each sample. What are the absolute and relative standard deviations for the average of each determination?
Transcribed Image Text:The sodium in a series of cement samples was determined by flame emission spectroscopy. The flame photometer was calibrated with a series of NaCl standards that contained sodium equivalent to 0, 20.0, 40.0, 60.0, and 80.0 µg Na2O per mL. The instrument readings R for these solutions were 3.1, 21.5, 40.9, 57.1, and 77. 3. a. Plot the data using a spreadsheet. b. Obtain a least-squares equation for the data. c. Calculate the statistics for the line in (b). (d) d. The following data were obtained for replicate 1.000-g samples of cement that were dissolved in HCl and diluted to 100.0 mL after neutralization. Emission Reading Blank Sample A Sample B Sample C Replication 1 5.1 28.6 40.7 73.1 Replication 2 Replication 3 4.9 28.9 4.8 28.2 41.2 72.1 40.2 Spilled Calculate the percentage of Na2O in each sample. What are the absolute and relative standard deviations for the average of each determination?
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