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Topic: Question about TLC  (Read 2103 times)

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Offline juliat99

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Question about TLC
« on: October 07, 2018, 07:58:18 PM »
Not sure about this question:
      "If a compound has a Rf by TLC of 0.1 with a mobile of 20% ethyl acetate and 80%, what should be done to achieve a Rf of 0.5?"
I get that the Rf value is the ratio of distance travelled by sample : total distance travelled by solvent.
I think that the percentage of ethyl acetate needs to be increased... by how much?
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Offline Borek

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Re: Question about TLC
« Reply #1 on: October 08, 2018, 03:38:05 AM »
IMHO there is not enough information to answer this question.
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Offline Babcock_Hall

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Re: Question about TLC
« Reply #2 on: October 08, 2018, 11:15:15 AM »
You can supply a qualitative answer, but not a quantitative one.
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Offline PKa

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Re: Question about TLC
« Reply #3 on: October 08, 2018, 10:38:02 PM »
You are thinking on the right lines, percentage of ethyl acetate needs to go up. I would run TLCs in a couple of different ratios of ethyl acetate to find out the answer
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