How much does a 250ml flask weight?

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RESmonkey

Diamond Member
May 6, 2007
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Forgot to measure the flask at school. Anyone know how much one should weigh in grams?
 
Brainonska511

Brainonska511

Lifer
Dec 10, 2005
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It varies from flask to flask.

I could have given you an estimate, but I don't have my lab notebook at home.
 
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RESmonkey

Diamond Member
May 6, 2007
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Empty; glass. Generic one that high school uses. It's okay if it's off...I'll just mention that I forgot to record the weight earlier on and found another flask to weight (even though this corrupts the lab).
 
DrPizza

DrPizza

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Mar 5, 2001
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If you want to be correct in the context of a science class (but be perceived as a smartass):

"How much does a 250 ml flask weigh in grams? NOTHING! Because grams aren't a unit of weight. Grams are a unit of MASS. I assume this was a trick question to see if we were paying attention."

The SI unit of weight is the Newton. Grams and kilograms are used informally as measurements of weight. However, informally should never include in a science classroom. Of course, I know in advance that there are people out there who feel that's it's okay to be lazy about the definitions in a chemistry class. Here you go, so no one needs to feel that they "proved me wrong" by finding some place that points out that grams aren't weight, "but it's okay in a chemistry class, but never in a physics class." Bullshit. I'm 17 weeks into the school year and *STILL* correcting a bad habit of students in physics class that should never have been allowed to become a habit in the first place. (It's one of my personal pet peeves, and I suspect, a pet peeve of physics teachers everywhere.)
 
K

KillerCharlie

Diamond Member
Aug 21, 2005
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Originally posted by: DrPizza
If you want to be correct in the context of a science class (but be perceived as a smartass):

"How much does a 250 ml flask weigh in grams? NOTHING! Because grams aren't a unit of weight. Grams are a unit of MASS. I assume this was a trick question to see if we were paying attention."

The SI unit of weight is the Newton. Grams and kilograms are used informally as measurements of weight. However, informally should never include in a science classroom. Of course, I know in advance that there are people out there who feel that's it's okay to be lazy about the definitions in a chemistry class. Here you go, so no one needs to feel that they "proved me wrong" by finding some place that points out that grams aren't weight, "but it's okay in a chemistry class, but never in a physics class." Bullshit. I'm 17 weeks into the school year and *STILL* correcting a bad habit of students in physics class that should never have been allowed to become a habit in the first place. (It's one of my personal pet peeves, and I suspect, a pet peeve of physics teachers everywhere.)
Click to expand...

Okay, but to be honest, he knows the difference and we know the difference so there's no harm done. If you point this out to a room full of engineers, they'll roll your eyes at you like you're an idiot.
 
P

potato28

Diamond Member
Jun 27, 2005
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Is it filled with 250 ml of water? Then the water weighs 250 g, but the flask will vary.
 
R

rezinn

Platinum Member
Mar 30, 2004
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I want to say about 450g based on memory for a 250ml erlenmeyer flask, but that seems heavy to me now.

edit: If you google "Erlenmeyer flask weighs" you get a bunch of homework problems. It looks like a 125ml flask might weigh about 121g, 250 about 240-260g, and maybe 500ml weighs 450g.
 
R

RESmonkey

Diamond Member
May 6, 2007
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Originally posted by: rezinn
I want to say about 450g based on memory for a 250ml erlenmeyer flask, but that seems heavy to me now.
Click to expand...

Yeah, that. Erlenmeyer flask is what it was called.
 
R

RESmonkey

Diamond Member
May 6, 2007
4,818
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I just made up values and false calculations. I was honest in my conclusion portion, though. I said I couldn't come to any conclusions because the lab was utter failure. There was some fatal calculations here and there, and much of the data wasn't recorded.

Oh, well. Hope I get at least some credit.
 
U

uclaLabrat

Diamond Member
Aug 2, 2007
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I was going to guess about 200-250g. For future reference, tare the flask. When you forget to do that, just ballpark a yield close to what the class is getting, and calculate a mass of product from that.
 
Throckmorton

Throckmorton

Lifer
Aug 23, 2007
16,829
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Originally posted by: DrPizza
If you want to be correct in the context of a science class (but be perceived as a smartass):

"How much does a 250 ml flask weigh in grams? NOTHING! Because grams aren't a unit of weight. Grams are a unit of MASS. I assume this was a trick question to see if we were paying attention."

The SI unit of weight is the Newton. Grams and kilograms are used informally as measurements of weight. However, informally should never include in a science classroom. Of course, I know in advance that there are people out there who feel that's it's okay to be lazy about the definitions in a chemistry class. Here you go, so no one needs to feel that they "proved me wrong" by finding some place that points out that grams aren't weight, "but it's okay in a chemistry class, but never in a physics class." Bullshit. I'm 17 weeks into the school year and *STILL* correcting a bad habit of students in physics class that should never have been allowed to become a habit in the first place. (It's one of my personal pet peeves, and I suspect, a pet peeve of physics teachers everywhere.)
Click to expand...

Someone better tell engineers that kg/m and g/cm are not valid torque units.
 
D

Davegod

Platinum Member
Nov 26, 2001
2,874
0
76
Originally posted by: RESmonkey
I just made up values and false calculations. I was honest in my conclusion portion, though. I said I couldn't come to any conclusions because the lab was utter failure. There was some fatal calculations here and there, and much of the data wasn't recorded.

Oh, well. Hope I get at least some credit.
Click to expand...

Maybe they give marks differently over there but over here its not about getting it "right", it's about getting there.

there's a reason why they make you write out the calculations and not put the figure shown in your calculator. it's so that when you get it wrong, you lose 1 mark for the mistake and keep points for everything you did right.

Making up reasonable values, so long as they are identified as such, allows you to continue the question. Confessing to even small mistakes are important too, it shows you know. Otherwise you would have lost another mark in the analysis. In "real life", if you know the mistake you'd just go look it up, do it again.

I consider this vital for undergoing any academic testing. You cant get stuck at every corner.
 
4

440sixpack

Senior member
May 30, 2000
790
0
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Originally posted by: rezinn
I want to say about 450g based on memory for a 250ml erlenmeyer flask, but that seems heavy to me now.

edit: If you google "Erlenmeyer flask weighs" you get a bunch of homework problems. It looks like a 125ml flask might weigh about 121g, 250 about 240-260g, and maybe 500ml weighs 450g.
Click to expand...

Obviously too late now, but the 50ml flasks I use are around 40g, so those other numbers are probably fairly good estimates.
 
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