Koj ua li cas piv cov nqi RF?
Koj ua li cas piv cov nqi RF?

Video: Koj ua li cas piv cov nqi RF?

Video: Koj ua li cas piv cov nqi RF?
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Koj faib qhov nrug ntawm koj tshuaj sib xyaw los ntawm nyob deb ntawm koj cov kuab tshuaj , thiab koj muaj Rf piv . Qhov deb a compound travelled, qhov loj nws yog Rf tus nqi. Logically, koj tuaj yeem xaus tias yog a compound Ib tug taug kev deb dua compound B nyob rau hauv lub polar solvent , ces nws yog ntau polar tshaj hnyav B.

Kuj nug, qhov txawv RF qhov tseem ceeb txhais li cas?

Cov Rf nqi Qhov loj dua ib Rf ntawm ib qho chaw, qhov loj dua qhov kev ncua deb nws mus ntawm TLC phaj. Thaum sib piv ob txawv cov tebchaw khiav nyob rau hauv zoo tib yam chromatography tej yam kev mob, lub compound nrog lub loj Rf tsawg dua polar vim nws cuam tshuam tsawg zog nrog cov polar adsorbent ntawm TLC phaj.

Kuj Paub, yog tus nqi Rf siab dua zoo dua? Qhov sib xyaw ua ke muaj zog dua yog khi rau cov adsorbent, qhov qeeb qeeb nws txav mus rau TLC phaj. Non-polar compounds txav mus rau lub phaj sai tshaj plaws ( tus nqi Rf siab dua ), whereas polar substances mus txog TLC phaj maj mam los yog tsis tag nrho (qis Rf nqi ).

Yog li ntawd, tus nqi Rf siab dua txhais li cas?

Rf = nrug deb taug kev los ntawm cov khoom / deb mus los ntawm hnyav pem hauv ntej. Ib siab Rf (Piv txwv li 0.92) yuav xa mus rau ib yam khoom uas tsis yog-polar. Piv txwv li, cov khoom no tau txav mus rau 92% ntawm tag nrho cov kev ncua deb ntawm cov kuab tshuaj mus. A qis Rf tus nqi (0.10) yuav xa mus rau ib yam khoom uas muaj polar heev.

Dab tsi cuam tshuam rau RF qhov tseem ceeb?

yam uas cuam tshuam tus nqi Rf yog:-• Lub cev hnyav thiab nws muaj pes tsawg leeg. Kub. Qhov zoo ntawm daim ntawv. Kev ncua deb uas cov kuab tshuaj khiav.

Pom zoo: