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Chapter 21: QA E (page 554)

Li was determined by atomic emission with the method of standard addition. Prepare a standard addition graph (Section 5 - 3) to find the concentration of Li and its uncertainty in pure unknown. The Listandard contained 1.62μgLi/mL.

Short Answer

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The standard addition graph:

Step by step solution

01

Definition of atomic emission.

Atomic emission spectroscopy (AES) is a chemical analysis method that employs the intensity of light produced at a certain wavelength from a flame, plasma, arc, or spark to quantify the amount of an element in a sample.

02

The standard addition graph.

The Li standard contained 1.62μgLi/mL.

The x intercept of the graph plotting intensity versus the concentration of the additional standard is 0.162±0.005μg/mL.

After 10 times diluting the sample, the original concentration will be 0.162±0.005μg/mL.

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