Atomic emission spectroscopy and the method of standard addition are used to determine the Na+ concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 μg/mL standard Na+ solution are added to a series of volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution. Unknown volume Standard volume (mL) (mL) Final volume (mL) Emission intensity 15.00 0.00 200.0 351.0 15.00 5.00 200.0 494.0 15.00 10.00 200.0 642.0 15.00 15.00 200.0 807.0 15.00 20.00 200.0 948.0 Based on the data in the table, determine the original concentration of Na+ and its uncertainty in the unknown sample. Report the uncertainty with three significant figures. concentration: μg/mL 土 μg/mL

Atomic emission spectroscopy and the method of standard addition are used to determine the Na+ concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 μg/mL standard Na+ solution are added to a series of volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution. Unknown volume Standard volume (mL) (mL) Final volume (mL) Emission intensity 15.00 0.00 200.0 351.0 15.00 5.00 200.0 494.0 15.00 10.00 200.0 642.0 15.00 15.00 200.0 807.0 15.00 20.00 200.0 948.0 Based on the data in the table, determine the original concentration of Na+ and its uncertainty in the unknown sample. Report the uncertainty with three significant figures. concentration: μg/mL 土 μg/mL

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter21: Surface Characterization By Spectroscopy And Microscopy

Section: Chapter Questions

Problem 21.5QAP

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Question

Atomic emission spectroscopy and the method of standard addition are used to determine the Na+ concentration and its
uncertainty in an unknown sample. Increasing amounts of a 1.75 ug/mL standard Na+ solution are added to a series of
volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of
200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution.
Unknown volume
Standard volume
Final volume
Emission
(mL)
(mL)
(mL)
intensity
15.00
0.00
200.0
351.0
15.00
5.00
200.0
494.0
15.00
10.00
200.0
642.0
15.00
15.00
200.0
807.0
15.00
20.00
200.0
948.0
Based on the data in the table, determine the original concentration of Nat and its uncertainty in the unknown sample. Report
the uncertainty with three significant figures.
concentration:
ug/mL
µg/mL

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