Beaker vs Flask?

Question

can someone give me estimates on this...I cant really find many sites comparing the 2 and when one should be used over the other. I figured the only reason to use a flask would be if you need to stopper it and mix. And im not sure about their percisions.

Question 2. Examine a 250 mL beaker available in your drawer. Compare the precision of these pieces
of equipment with that of a graduated cylinder, pipette and buret. What is the maximum precision that can
be achieved by using the beaker and the flask? (example: nearest 10 mL, nearest 1 mL, nearest 0.1 mL,
nearest 0.01 mL etc). When should a beaker or Erlenmeyer flask be used to measure volumes?

Answer 1

1. You would use a flask when you expect a gas to be emitted and collected as in distillation or a gas-producing reaction, or when you simply want to stopper it to keep the contents clean and prevent evaporation loss. If collecting an emitted gas you would use a 1-holed stopper and tubing. In some experiments a gas is passed into the flask and processed in some way in the flask, and the resulting gaseous product is collected; this would require a 2-holed stopper. Another use of a 2-holed stoppered flask would be to collect the liquid from a filter or separatory funnel, and to let out the displaced gas.
2. The precision of a flask is better than that of a beaker when the liquid comes up to the neck section where a small volume difference results in a larger height change. Assume you can read the liquid level to 0.05 inch, and that the liquid surface area in the beaker is 12 in^2 and that in the flask neck is 1.2 in^2. Then the best precision you can expect from the beaker would be 0.6 in^3 or about 10 ml whereas at the neck of the flask the precision would be about 1 ml.

Answer 2

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RE:
Beaker vs Flask?
can someone give me estimates on this...I cant really find many sites comparing the 2 and when one should be used over the other. I figured the only reason to use a flask would be if you need to stopper it and mix. And im not sure about their percisions.

Question 2. Examine a 250 mL beaker...

Answer 3

There are many types of flask. They're employed for refluxing, distillation, mixing, and titration.
Beaker is normally used as a container and simple reaction vessel.

Well, for precision you should see them for yourself. Look at the scales on the glass. Figure out the smallest increment you can measure using that instrument. If the scales are 10, 20, 30 ... mL then its precision is 10 mL.

You should never use either beaker or flask to measure volume. Use graduated cylinder.

Answer 4

A burette is used to dispense known amounts of a liquid reagent in a titration experiment. Burettes are extremely precise: class A burettes are accurate to ± .05mL.
Pipette is used for transferring or delivering measured quantities.
The main advantages in an Erlenmeyer flask are that it is less likely to tip over than a beaker and the smaller neck which slows evaporative loss. It can also be swirled without fear of the contents spilling.
Beaker is used for holding solutions requiring heat

Answer 5

A beaker is easier to dump things into, because of the wide mouth. They are also handy for coffee. (j/k)

As far as measurements, the beaker's straight side will let you estimate volume, although it's not as accurate as a graduated cylinder. I don't know if the beaker has markings, but a 250 ml beaker that is half full is about 125 ml.

The erlenmeyer flask has slanted sides, and it is very hard to estimate volumes from it, unless it is full.

Answer 6

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It doesn't matter what you use to weigh the liquid in, could be a flask or beaker or even an evaporating dish, as long as it's pre-weighed or tared. It would be better to use a pipet or grad cylinder for measuring the volume (more accurate). What do you mean why is it not done? We did it.

Answer 7

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