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Volumetric Flask for Measuring Volume

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Questions and Answers

What is the purpose of a volumetric flask?

To store solutions at varying temperatures

To measure volumes with an error range of 1-5%

To mix solutions in a laboratory setting

To measure a specified volume with an error range of 0.03-0.2% (correct)

How do volumetric flasks differ in the precision of volume measurement based on their size?

All flasks measure volumes to the tenth of a milliliter

Larger flasks measure volumes to the hundredth of a milliliter while smaller flasks measure to the tenth

All flasks measure volumes to the hundredth of a milliliter

Smaller flasks measure volumes to the tenth of a milliliter while larger flasks measure to the hundredth (correct)

How is the final adjustment of volume made in a volumetric flask?

By weighing the solution before adding more solvent

By pouring until it visually reaches the calibration mark

Using a measuring cylinder

Using a dropping pipet after adding solvent in portions (correct)

What is the primary function of a transfer pipet?

To deliver a specified volume of solution accurately Signup and view all the answers

How does the volume error of transfer pipets compare to that of equivalent volumetric flasks?

Transfer pipets and volumetric flasks have similar volume errors Signup and view all the answers

What is the correct method to adjust the liquid's level in a pipet to the calibration mark?

Ensure the meniscus is even with the glassware's calibration mark Signup and view all the answers

Why is it important for a volumetric flask to be inverted at least ten times during the mixing process?

To ensure complete dissolution of the reagent Signup and view all the answers

Why should a transfer pipet never be filled using mouth suction?

The liquid's level will not be accurate Signup and view all the answers

What happens if there are drops of liquid above the calibration mark in a volumetric flask?

The delivered volume is greater than the calibrated volume Signup and view all the answers

Why should you rinse a pipet or volumetric flask with the solution being measured before use?

To ensure accurate measurement of the solution Signup and view all the answers

What is the purpose of setting the liquid's level at the calibration mark of a pipet or volumetric flask?

To deliver the calibrated volume accurately Signup and view all the answers

How can dirt and grease affect the accuracy of liquid measurements in glassware?

They prevent liquids from draining evenly Signup and view all the answers