chapter 2-Terms Flashcards
It is used in classifying Chemicals
Reagent-grades
Why are Raegent-grades used in classifying Chemicals?
It conforms to the minimum standards set forth by the Reagent Chemical Committee of the American Chemical Society (ACS) and are used whenever possible in analytical work.
It is reagents that have been carefully analyzed by the supplier, and the results are printed on the container label.
Primary standard reagents
The (blank) is an excellent source for primary standards.
The National Institute of Standards and Technology (NIST)
Complex substances that have been exhaustively analyzed
Reference Standards
What are the chemicals that have been prepared for a specific application?
Special-Purpose Reagent Chemicals
Give two experiments to when the Special-Purpose Reagent Chemicals are used
Spectrophotometry and High-performance liquid chromatography
It is usually performed in duplicate or triplicate
Chemical Analysis
Why is evaporation frequently difficult to control?
It is because of the tendency of some solutions to overheat locally.
When does the bumping occur?
When a sample boils rapidly
If the bumping is sufficiently vigorous, what can it possibly cause?
Partial loss of the solution
How is the wet ashing done?
by adding sulfuric acid and heating to the appearance of sulfur trioxide fumes (in a hood)
Organic constituents can be frequently eliminated from a solution via?
Wet ashing
what does analytical balance do?
used to measure masses with high accuracy.
It is the less accurate balances that are also used for mass measurements when the demands for reliability are not critical
Laboratory balances
