An Analyst Prepares a Diluted Standard for Use in a Post-Mortem

question 29

Multiple Choice

An analyst prepares a diluted standard for use in a post-mortem toxicological assay. The analyst dilutes 2.0 uL of a commercial standard, 1.00 mg/mL, to 10.00 mL in a type A volumetric flask. A syringe is used to draw out and deliver the 2.0 uL. The absolute uncertainties of the equipment are:
Volumetric flask: 0.08 mL
Syringe: 0.10 uL
Commercial standard: 0.050 mg/mL
What is the final concentration of the diluted solution in ug/mL? WATCH THE UNITS and report to the correct number of significant figures

• A) 20.0
• B) 0.0020
• C) 2.00
• D) 120.0
• E) 0.120
• F) 1.20

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Definitions:

Optimal Extraction Level

The point at which the marginal cost of extracting a resource equals the marginal revenue, yielding the maximum possible profit.

User Cost

The cost associated with using an asset over a period, including wear and tear, depreciation, and possible opportunity costs of not investing elsewhere.

Interest Rates

The cost of borrowing money or the return on savings, usually expressed as a percentage of the principal amount.

Forests

Large areas covered predominantly with trees and underbrush, playing a crucial role in biodiversity, climate moderation, and providing raw materials.