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Chromatograms & Calculating Rf Values - Chromatography - GCSE Chemistry | kayscience.com
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- Опубликовано: 31 июл 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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Pov: Your exam is coming
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most helpful video ever, i've never understood chromatography before this so thank u sm
I like the comprehensive and succinct nature of this video. Helped me understand the topic much better than a 20 minute lecture. Thank you!!!
This is pure genius
good, simple video, helped me revise my concepts fast. Quizzes were spot on helpful!
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
Thanks. Perfect video to watch if you want to understand Rf value.
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This is a very comprehensive discussion and I appreciate the learning assessment in between! Thank you for this!
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I have my exam in an hour, and I can never understand some stuff, but this video helped so much
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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 ❤
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?
thanksnice video
You sound like Prof Snape...
Thanks for the video
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This is a great revision video based around chromatography. Thank you!
You are very welcome!
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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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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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life saver!
Thank you! Check out kayscience.com for 1000s of FREE quiz questions - hope you enjoy! Here you have access to ALL our videos here, let me know if you’d like a code for 25% off a subscription 😊
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
Simple. Efficient. Questions. Nice voice.
Thanks a lot 😊
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You're welcome!
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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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
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how many decimal places if you calculated the rf value?
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..
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
Where to find literature Rf values?
Google :)
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
can the RF value contain a unit such as cm or mm?
no! The Rf value has NO units
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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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Thanks
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You are very welcome! Please tell your friends about us :)
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