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  • Y_Shun
    Y_Shun's Avatar
    6,084 posts since Aug '06
  • lpx88
    lpx88's Avatar
    6,985 posts since Jun '05
  • Y_Shun
    Y_Shun's Avatar
    6,084 posts since Aug '06
  • hisoka
    hisoka's Avatar
    33,063 posts since Mar '05
    • 16 Oct `07, 11:20PM
      Originally posted by Y_Shun:
      actually i want to ask c) more

      use organic solvents instead of water

  • metalcar
    metalcar's Avatar
    824 posts since Dec '06
  • dbowie
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    4,041 posts since Mar '07
    • 17 Oct `07, 8:08PM

      organic solvent and solvent is diff leh.
      water is also a solvent.

      i think a) A
      b) b
      c) use organic solvent.

  • Y_Shun
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    6,084 posts since Aug '06
  • Hocklez
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    4,593 posts since Oct '03
    • 17 Oct `07, 8:29PM

      actually, why u don just mark all the questions u guys donno and ask ur tutors in one shot? faster right?

  • Moderator
    ^tamago^
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    51,105 posts since Sep '03
    • 17 Oct `07, 8:34PM
      Originally posted by Y_Shun:
      can elaborate more abt the organic solvent thingy?

      since the dye is not soluble in water, it will not travel through it as a medium. instead it requires an organic solvent for it to travel.

      since it has been given that there are 2 dyes in B, they will travel at a different speed due to a different solubility. however, we need an organic solvent for them to travel and seperate in the first place.

  • dbowie
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    4,041 posts since Mar '07
    • 17 Oct `07, 8:46PM

      ok.
      ionic substance is insoluble in organic sub but not water
      covalent sub. is soluble in organic sub but not water
      so same sub. solubility diff.
      u get it ?

  • Coffee Gabriel
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    44 posts since May '07
  • wonderamazement
    stealth.
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    12,765 posts since Dec '04
    • 22 Oct `07, 11:47PM
      Originally posted by ^tamago^:
      since the dye is not soluble in water, it will not travel through it as a medium. instead it requires an organic solvent for it to travel.

      since it has been given that there are 2 dyes in B, they will travel at a different speed due to a different solubility. however, we need an organic solvent for them to travel and seperate in the first place.

      Any example of an organic solvent?

  • hisoka
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    33,063 posts since Mar '05
  • Moderator
    ^tamago^
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    ^tamago^'s Avatar
    51,105 posts since Sep '03
    • 22 Oct `07, 11:52PM
      Originally posted by wonderamazement:
      Any example of an organic solvent?

      ethanol or methanol also can.

  • KuraKura
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    5 posts since Oct '07
    • 23 Oct `07, 1:25PM

      hmm... i was thinking, it's the level of water Smile
      say, is you give more distance (or space) for it, you might see them separate from each other? hehe.. my lazy-to-think-a-lot brain thinks so.

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