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Laboratory Procedures: Stock Solutions and Dilution

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Laboratory Procedures: Stock Solutions and Dilution

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Questions and Answers

How is a stock solution typically prepared?

By dissolving an unknown solid in a solvent

By measuring out an appropriate volume of a pure liquid and diluting it to a known volume (correct)

By randomly mixing various chemicals together

By heating a solution to a high temperature

Which acid is recommended for dissolving metals that are above hydrogen in the electromotive series?

Phosphoric acid

Acetic acid

Sulfuric acid

Hydrochloric acid (correct)

What happens to perchloric acid when heated to drive off water?

It becomes more basic

It becomes less corrosive

It becomes a strong and efficient oxidizing acid (correct)

It becomes a neutral solution

What is dilution in the context of preparing solutions?

The process of preparing a less concentrated solution from a more concentrated solution Signup and view all the answers

Which acid is known for dissolving most common metals and destroying traces of organic matter?

Nitric acid Signup and view all the answers

Why is it advised to use perchloric acid with extreme caution?

Because it reacts explosively with easily oxidizable substances Signup and view all the answers

What is the most commonly employed technique for the destruction of organic and biological materials for inorganic analysis?

Dry Ashing with no chemical aids Signup and view all the answers

Which element traces can be recovered with little loss by retention or volatilization using dry ashing?

Lead, zinc, cobalt, antimony Signup and view all the answers

In wet digestion with a mixture of nitric and sulfuric acids, what does the nitric acid primarily do?

Destroys the bulk of the organic matter Signup and view all the answers

What method is used to express precision in analytical measurements?

All of the above Signup and view all the answers

What is the relative error range for moderately accurate analytical methods?

1% - 5% Signup and view all the answers

What is the relationship between precision and accuracy in analytical measurements?

Good precision does not assure good accuracy Signup and view all the answers