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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 10.00 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) 0.00 5.00 10.00 15.00 20.00 (mL) 10.00 10.00 10.00 10.00 10.00 Final volume (mL) 200.0 200.0 200.0 200.0 200.0 Emission intensity 325.0 468.0 616.0 781.0 922.0 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.

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 10.00 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) 0.00 5.00 10.00 15.00 20.00 (mL) 10.00 10.00 10.00 10.00 10.00 Final volume (mL) 200.0 200.0 200.0 200.0 200.0 Emission intensity 325.0 468.0 616.0 781.0 922.0 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.

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
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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.

**Atomic Emission Spectroscopy and Na⁺ Concentration Determination** Atomic emission spectroscopy and the method of standard addition are used to determine the sodium ion (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 10.00 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. The following table provides the data: | Unknown volume (mL) | Standard volume (mL) | Final volume (mL) | Emission intensity | |---------------------|----------------------|-------------------|--------------------| | 10.00 | 0.00 | 200.0 | 325.0 | | 10.00 | 5.00 | 200.0 | 468.0 | | 10.00 | 10.00 | 200.0 | 616.0 | | 10.00 | 15.00 | 200.0 | 781.0 | | 10.00 | 20.00 | 200.0 | 922.0 | **Task:** 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. **Output Fields:** - Concentration: _______ µg/mL - Uncertainty: ± _______ µg/mL
Transcribed Image Text:**Atomic Emission Spectroscopy and Na⁺ Concentration Determination** Atomic emission spectroscopy and the method of standard addition are used to determine the sodium ion (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 10.00 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. The following table provides the data: | Unknown volume (mL) | Standard volume (mL) | Final volume (mL) | Emission intensity | |---------------------|----------------------|-------------------|--------------------| | 10.00 | 0.00 | 200.0 | 325.0 | | 10.00 | 5.00 | 200.0 | 468.0 | | 10.00 | 10.00 | 200.0 | 616.0 | | 10.00 | 15.00 | 200.0 | 781.0 | | 10.00 | 20.00 | 200.0 | 922.0 | **Task:** 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. **Output Fields:** - Concentration: _______ µg/mL - Uncertainty: ± _______ µg/mL
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