Chromatograms & Calculating Rf Values - Chromatography - GCSE Chemistry | kayscience.com
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- เผยแพร่เมื่อ 31 ก.ค. 2024
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The Rf value of a substance is dependent on how soluble the substance is in the solvent. The most soluble solute finishes highest in the solvent, as it has the weakest attraction to the paper, so it can travel the furthest in the solvent. The most soluble solute will have the highest Rf value. If a substance is pure there will be one spot. If a substance is impure there will be more than one spot. The sample with the greatest number of coloured compounds will have the most spots. If coloured compounds in different samples finish on the same level, then they are the same coloured compound. If a sample does not move from the start line, then it is insoluble in that solvent.
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This is pure genius
I like the comprehensive and succinct nature of this video. Helped me understand the topic much better than a 20 minute lecture. Thank you!!!
most helpful video ever, i've never understood chromatography before this so thank u sm
i'm not even english but i have an exam on this tomorrow and there are not a lot of these kinds of explaination videos in my language so im glad i found this one :)
it was very helpful
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Thanks. Perfect video to watch if you want to understand Rf value.
Fantastic explanation. Thank you so much!!!
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This is a very comprehensive discussion and I appreciate the learning assessment in between! Thank you for this!
You are very welcome! Please tell your friends about us :)
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Can the level at which you draw the solvent front determine the Rf value of the compound and if so, does it not make the Rf values differ by 1 or 2cm per person?
Thank you, I didn't even know this was something on the exam until today
I have my exam in an hour, and I can never understand some stuff, but this video helped so much
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Sir my compounds are non polar compounds. so which solvent do I use for dissove the compound and what solvents do I use in the mobile phase? sir can you tell me a little bit? I am facing a lot of problems in tlc checking
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I m preparing for NEET UG in INDIA this was very helpful to me.....like I got PhD in paper chromatography..... thanks ❤
Thanks...
Good explanation.
This is a great revision video based around chromatography. Thank you!
You are very welcome!
How can we determine the molecular mass of the compound from the Rf value? I mean, can we determine the molecular mass from chromatography?
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I just used this pen: Uni Pin Fineliner Drawing Pen - Sketching Set - Black Ink - 0.5mm :)
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You're aweeeeeeeesome. Thank you!
Very clear, excellent explanation.
Thank you. I understand it much better now
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Thank you
Thanks❤️
When measuring the height of a spot do you measure to the middle of the spot, the top of the spot or the bottom of the spot?
The middle
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What if the solute is above the solvent line. I understand that the rf value is never greater than 1, but how do I figure this out then
the solute is dissolved in the solvent, so can only ever reach as far as the solvent front, which means the maximum number can only ever be 1. The solute cannot dissolve in the paper, which is why the solute cannot be in front of the solvent front.
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excellent
Very Informative Video
thank you :) glad you enjoyed it
how will you calculate 5th mixture? there are like 3 spots there do we take each spot and calculate or the highest spot?
You can calculate the Rf value of each individual spot. The Rf values are then compared against a known database of how different substances have travelled in that particular solvent to identify the solute. Hope that helps?
@@KayScience how will I name these spots?what do i name them
what if the question doesnt say what the distance moved by the ink and the solvent is, how would you divide it if you have no measurements
you wouldn't as there would be no data to use! only calculate Rf data if given the data in the exam
@@KayScience thanks, i was searching up practice questions online, and half of them didnt have any data
life saver!
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Super 👌
wonderful explanation
Glad you think so! You are very welcome 👍 visit kayscience.com for all of our videos and quizzes to help you with your revision 🔥
20 mins before the exam actually saved me
KayScience
l have been asked to compare my RF values to a known value/ literature values l but l don't know how to work out / find the known value and l would appreciate it if you could help me out with this
Distance moved by solute / distance moved by solvent
Simple. Efficient. Questions. Nice voice.
Thanks a lot 😊
👍🏻
Where to find literature Rf values?
Google :)
good video!
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THANK U
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how many decimal places if you calculated the rf value?
can the RF value contain a unit such as cm or mm?
no! The Rf value has NO units
✨😃🎁 THANK YOU...
your welcome
Hi there, how to find the Rf value for the mixture that with more than one spot? thanks for the video.
Hi, you find the Rf value of each individual spot in a mixture. Each spot in the mixture has its own Rf value. Hope that helps?
@@KayScience thanks, this helps a lot.
Rf value=ratio of distence travelled by a component /to the ratio of distence travelled by the solvent.
@@FASILHANEEF Hi faisal, thank you for your comment, but you can simplify that by:
Rf value = distance travelled by a component / distance travelled by solvent
THE Rf VALUE IS ALWAYS BELOW 1!
@@KayScience okay..thankyou..
Too much helpful really greatful to you
Thanks alot
so glad it helped you! :) head over to kayscience for all our videos and self-marking quizzes
yeah btw question 10 in the ppt answer is wrong it is 0.38
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Why value of Rf is always less than 1
Because normally the solvent front will be a greater distance travelled compared to the distance travelled by the solute dissolved in the solvent. The equation to calculate Rf value is distance moved by solute / distance moved by solvent front. Therefore a smaller number divided by a bigger number always gives a number smaller than 1.
Thanks
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Didn't know that Stitch taught in chemistry
Thanks
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You are very welcome! Please tell your friends about us :)
Thanks
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