when we performed the TLC experiment, the class chose a mixt...

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when we performed the TLC experiment, the class chose a mixturefor the...

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We have non polar hexane and a very highly polar ethyl acetate The affinities of alkaloids and various other components towards an eluent are different due to the different magnitudes of dipole or polarities that they have You need a right combination of hexane and ethyl acetate to ensure enough resolution of the components of a mixture and a decent rate of elution It is a trade off Large quantities of hexane relative to ethyl acetate would facilitate very good separation of the components but with very slow elution of the required alkaloid Because the affinities of the components are not only very different but also very low towards hexane It is the opposite when ethyl acetate is used The elution is fast the resolution is low and you may still get back a mixture of alkaloid ....

when we performed the TLC experiment, the class chose a mixture for the mobile phase of...

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Chemistry

when we performed the TLC experiment, the class chose a mixturefor the mobile phase of 80 % ethyl acetate and 20 % hexanes. whywas this composition chosen

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