Homework Answers
For compound A , retardation factor, Rf = distance travelled by compound A/distance travelled by solvent
= 3.0 cm / 7.0 cm
= 0.43
For compound B , retardation factor, Rf = distance travelled by compound B/distance travelled by solvent
= 4.5 cm / 7.0 cm
= 0.64
In normal chromatography mobile phase is a polar solvent .
So polar solvent dissolves the polar compound and it travel the polar compound along with this so polar compounds will ellute.
Therefore compound B is more polar.
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A student analyzed a mixture of two unknown compounds, A and B. The picture below shows...
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10. On the TLC plate below, identify the spots in the unknown mixture as compound A,...
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10. On the TLC plate below, identify the spots in the unknown mixture as compound A,...
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2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
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The goal of this experiment is to separate a mixture of two unknown compounds into individual Components and to identify the compounds. Answer the questions below. More than one answer may be possible. Why do we need to be especially careful when working with diethyl ether? Fumes can cause drowsiness & dizziness, and in high concentration, loss of consciousness Because it is highly acidic and can burn the skin Because it is extremely volatile and flammable. Of all of the...
10. On the TLC plate below, identify the spots in the unknown mixture as compound A, B, and C and calculate all Rt values. Lanes with X are unknown sample spots. State whether the solvent system used is a great one for the separation of the compounds. + A B X
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Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent ion= 2.05Smin low Peak 1 Compound Name: athanol Rapesnal utanal aclapeatanal 4.755min oilng 6.895min .230 min Peak 2 Compound Name: Peak 3 Compound Name: Peak 4 Compound Name: GC#:1 Ketone Standard Mixture Retention time 2.575un Peak 1 Compound Name: Acclono Butanon a Pentanone 2tHex anon Peak 2 Compound Name: min Peak 3 Compound Name: 615 min 1D. 307 min Peak 4 Compound Name: Part...
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2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
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