a volumetric flask is calibrated to hold a liquid at what temperature This is a topic that many people are looking for. khurak.net is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, khurak.net would like to introduce to you Volumetric Flask. Following along are instructions in the video below:
This video. Youre going to learn how to use a volumetric flask before watching watching this video make sure youve seen the meniscus video. This is a volumetric they are easily recognizable by the wide base and the long thin neck volumetric flasks are used to dilute solutions to very specific and precise volumes.
Each volumetric flask is designed to hold one specific volume. The volume is indicated by the number at the base of the flask. The graduation on the neck of the flask indicates.
Where the meniscus should lie. When the flask is filled correctly as you can see i have a prepared solution that i wish to dilute to an exact volume to do this ill use a volumetric flask before using it its important that you rinse it thoroughly to do this you will use your solvent in this case. Its deionized water add small aliquots of the solvent to the flask and then cap.
It swirl the solvent around making sure to coat the entire inner surface of the flask.
Then drain the solvent into the waste beaker. When draining dont shake your volumetric flask. Because this can damage it do this several times before using it now that your flask is clean you can begin to transfer your solution to do this place a funnel in the top of your flask and put your stirring rod down the center of the funnel slowly pour your solution down the stirring.
Rod transferring this way helps to prevent your solution from splashing out of the flask. Its important not to pour too quickly and overfill the funnel because that can result in a loss of some of your solution. Now that youve emptied your solution from the beaker to the flask.
There is still some solution remaining on the edges of the glassware to make sure this all enters. The flask. We continue the process of quantitative transfer.
The first step is rinsing out the beaker throroughly with your solvent in my case.
Its deionized water rinse. The inside of the beaker and pour the rinsings into the flask and down the stirring rod just as before do this three times to ensure that all of your solution is being removed from the beaker. Using several small aliquots to rinse is more effective than using one large.
One now. Its important to also rinse down your stirring rod in both the inside and stem of your funnel make sure to watch the amount of solvent you are using when making your rinsings because you dont want to fill the volumetric flask past the graduation once youve finished with your rinsings cap the flask and invert it several times to mix what youve put in so. Far.
Let the mixed solution settle and then fill it up with your solvent in this case. Its deionized water fill it up to roughly one centimeter below the top graduation at this point. Youll need to be careful not to overfill your flask.
Youll want to begin adding drop wise.
The best way to do this is to decant. Some of your solvent and add it to the flask with a dropper or a pasteur pipette again you can do this quickly at first. But youll want to slow down and do more drop wise as you get closer to the graduation try not to touch the inside of the flask with the tip of your dropper.
Because this can cause contamination fill. It slowly until the bottom of the meniscus lines up with the top graduation. Youll have to do this very carefully because if you go over by even a small amount you will have to start again now that youve filled your flask with the correct volume.
Its important to mix it just as ive shown before this ensures. That your solution is properly diluted. Once your solution has been properly prepared you can accurately know the volume.
Knowing this you can calculate the concentration of the solution inside your volumetric flask. Doing this properly takes some time and some practice. But if you follow the instructions that ive told you youll be able to master it in no time .
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