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Using a Balance | MIT Digital Lab Techniques Manual

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Using a Balance
Correct usage and maintenance of a balance is a basic skill that is essential in any laboratory procedure.
Created by Dr. Kimberly Berkowski and Eileen Huang.
View the complete resource at: ocw.mit.edu/resources/res-5-00...
License: Creative Commons BY-NC-SA
More information at ocw.mit.edu/terms
More courses at ocw.mit.edu
WARNING NOTICE:
The experiments described in these materials are potentially hazardous and require a high level of safety training, special facilities and equipment, and supervision by appropriate individuals. You bear the sole responsibility, liability, and risk for the implementation of such safety procedures and measures. MIT shall have no responsibility, liability, or risk for the content or implementation of any of the material presented. Legal Notice - ocw.mit.edu/terms

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6 авг 2024

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Комментарии : 22

@robertaflorentino7609 2 года назад

It was a very useful video! I’m watching because my chemistry professor from university asked for, and I’m very excited to begin my chemistry journey❤️

@drewar2648 3 года назад

What a thorough and comprehensive video, thank you! One point to consider: perhaps the presenter should have been wearing her safety glasses and gloves even though she was only presenting and not actively doing any lab work. Jusy for internal consistency for lab safety procedure. Perhaps an annotation or a note about it since the video is already recorded?

@drewar2648 3 года назад

@@NerdyNEET Thank you for sharing your insights. But there are many things chemists used to do before we knew better. And when we know better, we should do better. So, even though we didn't get here for the individual's protection, I'm glad we're here now. Your message implies a disbelief in PPE, so if that is the case, then I'm gonna respectfully disagree with you on that 🙏🏼

@kittywaymo 11 лет назад

Well done!

@reubenbredenkamp9218 7 лет назад

Please, stop breathing on my chemicals.

@graysoncat2524 8 лет назад

A 4 decimal place (using grams) balance will not weigh fingerprints and the weighing paper can be removed from the balance to add chemicals without affecting the mass. In this case it might be easier to weigh into a beaker. Yes, it saves the balances from having chemicals spilled into them. If you use a five decimal place balance, then the fingerprints matter.

@drewar2648 3 года назад

But if your gloves are clean and dry, do you think that would leave any significant finger print mass for glass sample vials? I tell my students to make sure of this before using the 4dp g Analytical Balances. Tell me your thoughts when you can. Cuz atm, I think this is acceptable

@foreverkenzie2397 8 лет назад

great video. just a suggestion though: better volume consistency.

@drewar2648 3 года назад

Can you elaborate please?

@foreverkenzie2397 3 года назад

@@drewar2648 Sound/audio in the video is a bit all over the place so you have to continually adjust it while watching :)

@drewar2648 3 года назад

@@foreverkenzie2397 OMG I feel so silly! I thought you were talking about Liquid Volume Consistency! Didn't realise it was a technical note lol. Thanks for clearing that up Kenzie! 🤣🤣🤣🤣🤣

@foreverkenzie2397 3 года назад

@@drewar2648 all good, when the notification came up even I questioned myself and understood where you could be confused. Glad to help

@ProxySpam 14 лет назад

Once the weight paper is on the balance with chemicals on it, it stays on the balance until you get the 4 digits you are looking for. The chemical balance is done on top with a spatula. If you get the exact reading you close doors and see if it's really the reading you want. I know why they tell you to add/remove chems outside the balance...the faculty doesn't wana pay extra maintenance costs to clean them...you will be much more precise if you let the damn thing in there ^_^

@drewar2648 3 года назад

Totally agree. However, while they are actively learning I accept the inaccuracies and decreases in precision that come with the removing and adding method. In my experience, ppl naturally and automatically switch to the weighing directly on the pan once they develop more skill and fine motor dexterity.

@ProxySpam 3 года назад

@@drewar2648 You gotta be patient with brilliant chemistry students. They can sometimes make some methamphetamine behind your back, set the fumehood on fire with manganese heptoxide but that's ok, it's part of their "genius learning process" compared to a student who doesn't wana do anything. Do you really know a brilliant chemist who never made methamphetamine before going on a date knowing they will have sex? It's normal.

@caylah1724 5 лет назад

my brain hurt

@imagineuploading 6 лет назад

HELLO GUYS

@ProxySpam 14 лет назад

Lol :D

@robertaflorentino7609 2 года назад

I’m here for academics purpose

@ProxySpam 14 лет назад

Nice guide but unrealistic. Nobody in his right mind would go through all those steps when you have 100 measurements waiting for you, and also considering you have to go home to eat or spend time with your kids ^_^

@drewar2648 3 года назад

This is a teaching lab. By the time someone reaches the stage where they have 100 consecutive measurements to do, they're going to be both skilled and wise enough to switch to weighing directly on the balance lol