11) A compound which is 90 % pure can be purified by which technique? Hint Extra
ID: 554978 • Letter: 1
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11) A compound which is 90 % pure can be purified by which technique? Hint Extraction or Recrystallization 12) A mixture of two solid compounds can be separated by which technique? Hint Extraction or Recyrstallization 13) A mixture of liquids wilbrsmall differences in boiling points (-5 and 25 °C) can be separated by which technique? 14) Define R as used in Thin Layer Chromatography. To run the TLC successfully, we need a mobile phase and an immobile phase. What are they? Give examples Mobile Phase Immobile Phase: 15) A compound moves 10 cm up the TLC plate. The solvent front moves 20 cm up 16) In normal phase TLC the nonpolar compounds move faster than polar 17) If a mixture of compounds were separated on a TLC plate, based on the the TLC plate. What is the Rr of the compound. compounds. Do you agree? If so why? polarity, can we separate them on a preparative column chromatography? 18) In a reverse phase TLC, the polar compounds move fast onpolar compounds. Do you agree?Explanation / Answer
Ans 11 : Recrystallization
Recrystallization is the technique used to purify the materials on the basis of their solubility in the solvent medium. The compound and its impurities are both soluble in solvent at high temperature , and one of them becomes insoluble at room temperature which can be then seperated out.
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