Question

Which of the following is a "to deliver" device?

Select one:

a. None of the choices.

b. graduated cylinder

c. volumetric flask

d. volumetric pipet

e. beaker

Answer 1

Solution: Correct option D) Volumetric pipet

Explanation:

Volumetric glassware can be divided into two categories: those designed to contain a specified amount of liquid and those designed to deliver a specified amount of liquid. Glassware designed to contain, like graduated cylinders and volumetric flasks, are usually marked with a TC. When the liquid is poured from a piece of glassware a small amount remains behind, clinging to the sides of the vessel. A 100 ml volumetric flask is designed to hold exactly 100 ml, but if the liquid is poured out it will actually deliver a little less than 100 ml. Glassware designed to deliver, like pipets and burets, are marked with a TD. These pieces of glassware account for the small amount of liquid that remains behind. A 100 ml pipet contains a little more than 100 ml of liquid, but when the liquid is drained from a pipet, exactly 100 ml is delivered