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:

Cost Method

An accounting approach for investments, where the investment is recorded at cost and adjusted only for dividends received, impairments, and certain other limited circumstances.

Consolidated Statement

A financial report that combines the assets, liabilities, equity, income, expenses, and cash flows of a parent company and its subsidiaries.

Land Holding

Real estate or land owned by an individual or entity, including the natural resources and rights that come with the property.

Unrealized Profit

Profits that have been earned but not yet realized through a transaction, often related to investments that have increased in value but have not been sold.