Question

Which of the following will be good 2 marks
solvent for phenanthrene having
solubility parameter (delta value)
equal to 9.8
O hexane (delta value = 7.3)
O water (delta value = 23.4)
ethanol (delta value = 13)
O carbon disulfide (delta value = 10)​

Answer 1

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Answer 2

PHENANTHRENE

water (delta value = 23.4) and ethanol (delta value = 13) will be good solvent for phenanthrene having solubility parameter ( delta value ) equal to 9.8.

WHY USING ETHANOL AND WATER AS SOLVENT FOR PHENANTHRENE:

* Ethanol and water will be your solvents of choice. Phenanthrene is water insoluble but easily soluble in ethanol. Weigh out 0.1 g of phenanthrene and dissolve it in a small amount of boiling ethanol using the same process as before.

*  Then, drop by drop, add water until the solution is just hazy, even when it's heated. After that, add a few drops of hot ethanol to the hazy solution until it clears up, then take it from the hot plate and let it cool to room temperature undisturbed.

*  Phenanthrene crystallizing out of the solution should be visible. During this time, fill an Erlenmeyer flask with 6 mL ethanol and 2 mL water and cool it in an ice bath must be used in the washing of the crystals Because the makeup of this solvent mixture is similar to that of the solution in which your phenanthrene is now dissolved, it should work well for washing the crystals.