pipet vs buret

[spoog74]

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okay, when do you use pipet and when do you use buret?

I know buret is more accurate in measurement, thus if you were to measure 15.23 mL you would measure it with a buret.

I came across a question that asked if you wnated to measure 15.6 mL , the answer was pipet. Why would that be? How would you differentiate and what are the cut off numbers for pipet and buret

Im also going to start a thread for the type of lab instruments we should be familiar with, im sure it should help


( i know im asking way too many questions on this board the last few days, i just have my test days away, so id like to learn as much as possible and get all the confusion out of the way)..


Thank you all

 

[LetsGo2DSchool]

I know that pipets usually come in predetermined fixed whole number measurements such as 25 mL or 50 mL or 100 mL, etc. You basically fill the pipet with the liquid up to the line and that would be the exact measurement, no more no less.

With a buret, usually used in titrations, you actually can control the exact amount and thus if you are dealing with a measurement such as 21.2 mL, then you can precisely measure this amount.

 

[vicsin]

okay, when do you use pipet and when do you use buret?

I know buret is more accurate in measurement, thus if you were to measure 15.23 mL you would measure it with a buret.

I came across a question that asked if you wnated to measure 15.6 mL , the answer was pipet. Why would that be? How would you differentiate and what are the cut off numbers for pipet and buret

Im also going to start a thread for the type of lab instruments we should be familiar with, im sure it should help


( i know im asking way too many questions on this board the last few days, i just have my test days away, so id like to learn as much as possible and get all the confusion out of the way)..


Thank you all

That question in destroyer drove me nuts also. I figured the difference in the two q's is that the one where buret is the answer, you are doing a titration (measuring out an amount of NaOH base). So there you use a buret. In the other question which I believe is in the orgo section, pipet is better.

 

[jwnichols21]

That question in destroyer drove me nuts also. I figured the difference in the two q's is that the one where buret is the answer, you are doing a titration (measuring out an amount of NaOH base). So there you use a buret. In the other question which I believe is in the orgo section, pipet is better.

So is it safe to say if it's in the GChem section, answer is buret and if it's in the OChem section, answer is Pipet?! 😕

 

[dmdluffy]

I know that pipets usually come in predetermined fixed whole number measurements such as 25 mL or 50 mL or 100 mL, etc. You basically fill the pipet with the liquid up to the line and that would be the exact measurement, no more no less.

With a buret, usually used in titrations, you actually can control the exact amount and thus if you are dealing with a measurement such as 21.2 mL, then you can precisely measure this amount.

This! Pipets are accurate only for predetermined quantities. If you're measuring any other quantities, burets provide the highest level of accuracy. So it really depends on the type of experiment you're doing.

 

[dmdluffy]

I guess to add on, if you think about titrations, you don't know the exact amount of acid/base you need to add. Compare this with any kind of molecular technique (PCR, gels, ELISAs) or even serial dilutions of bacterial inoculum all use a predetermined volume like 100 microliters or 1 milliliter so it has better accuracy. Hope this helps!

 

[jwnichols21]

This! Pipets are accurate only for predetermined quantities. If you're measuring any other quantities, burets provide the highest level of accuracy. So it really depends on the type of experiment you're doing.

But..OChem destroyer asked for 15.6 ml which is not a fixed, whole number. And the answer was Pipet. Whereas in GChem, I've seen this problem a couple of times and have always said Buret and it was correct. Over there, it too was a decimal amount.

 

[Chowder]

Pipets are used for transferring while a buret is used for accurate measurements. Remember doing the experiment in Gchem lab where you had to use the lever on the buret to measure the exact amount of liquid you dispensed into a solution with an indicator righttttt before it changes color.

 

[jwnichols21]

I'm still really confused on this. Both times the question has been pretty much the same, what would you use to transfer x amount of liquid and x is always a pretty fixed amount, rounded to 1 decimal. I've seen the answer be pipet and buret How do we know which one it is? Help please.

 

[jwnichols21]

Bump. Help help help

 

[v35]

I answered a similar question here on this thread with examples:

http://forums.studentdoctor.net/showthread.php?t=849395