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?
Chapter27: Molecular Fluorescence Spectroscopy
Section: Chapter Questions
Problem 27.9QAP
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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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