Quick Answer: Why Should A Hot Solution Never Be Poured Into A Volumetric Flask?

Why use an Erlenmeyer flask instead of a beaker?

Swirling in a conical flask makes the solution run back down, rather than slosh over the edge, so there is less chance of spilling.

With a beaker it is more likely that some part of your sample will slosh out..

Why is a volumetric flask shaped that way?

When the glassware was made by hand, the bulb at the bottom varied in size, so each flask had to be filled with the correct volume before the line could be etched on the glass. A tube was used for the neck since the volume filling the tube would change at a consistent rate. … The flask looks like a pear shaped container.

Why should you never heat a volumetric flask or add a hot solution to it?

These containers are calibrated at a specific temperature to deliver or contain VERY PRECISE amounts of liquid. Heating the glassware or using heated solutions distorts the calibrated volume! Volumetric (“vol”) containers are expensive and should be handled with care.

Why do we not pipette directly from the volumetric flask?

NEVER pipet directly from a volumetric flask. … Volumetric flasks are likely to tip and break when a pipet is inserted into the neck of the flask. Instead, transfer the solution to a clean, dry storage container (a beaker, Erlenmeyer flask, or plastic storage bottle) for further use.

Can an Erlenmeyer flask be heated?

So, although Erlenmeyer flasks can be heated, they are not specifically designed for high temperature, constant heating applications. For this, you should use a boiling flask. … Since most Erlenmeyer flasks are made with Pyrex glass, there should be no problem heating them up.

What happens if you overfill a volumetric flask?

Once liquid is filled to the mark, cap the flask with a stopper and mix as before. Overfilling the flask above the graduation mark ruins the volume measurement. In this case, the content inside the volumetric flask should be discarded. A pipette bulb should be used to withdraw and deliver liquids when using a pipette.

How accurate is a volumetric flask?

Volumetric flasks, burets and pipets are the most accurate with tolerances of less than 0.2%. To achieve these accuracies the person using the device needs to use the proper technique and the measurements need to made at the temperature for which the glassware was calibrated (usually 20 degrees C).

What is the difference between a beaker and a flask?

Flasks are notable for their unique shape: a rounded vessel and a cylindrical neck. … The main differing characteristic between a flask and a beaker is that beakers have straight sides, rather than slanted sides like a flask. Beakers are mainly for measuring and transporting liquids from one site to the next.

Can volumetric flask be heated?

Volumetric flasks are flasks used to measure specific volumes of material. … Because the volumetric flask function is to generally be used for measurement or reactions and not heating or boiling, they can be made of plastic or glass.

Why would you use a volumetric flask instead of a graduated cylinder?

The volumetric flask is used for measuring accurate volumes of liquid materials for laboratory experiments. They are favored when available because they are more accurate than graduated cylinders and beakers, which are other pieces of equipment that are used to measure liquids.

Why is a volumetric flask more accurate?

This is because, they are graduated and are calibrated to contain just the right amount of volume. You can recognize a volumetric flask by its long neck and a flat bottom. This is the reason why they are more accurate than the other measuring glassware used in chemistry.

Why is it acceptable to use a clean wet volumetric flask?

In order to avoid a volume disorder, the volumetric glassware should not be dried by heating. … When an aqueous solution is prepared in a volumetric flask, the solution is eventually diluted with water. Therefore, a flask wet with water can be used without the rinsing operation.

What are characteristics of an Erlenmeyer flask?

Erlenmeyer flasks are recognizable from their basic characteristics: flat bottom, conical body, and long, cylindrical neck. They are named for German chemist Emil Erlenmeyer.

Why is an Erlenmeyer flask not accurate?

Beakers and Erlenmeyer flasks should not be used to measure volume unless you need only a very crude estimate because their accuracy for volume measurements is so poor. They can hold a much larger volume than any of the other types of glassware, however, which makes them useful for mixing solutions.

Which is more accurate graduated cylinder or volumetric flask?

Graduated cylinders are generally more accurate and precise than laboratory flasks and beakers, but they should not be used to perform volumetric analysis; volumetric glassware, such as a volumetric flask or volumetric pipette, should be used, as it is even more accurate and precise.