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Posted by on Wednesday, October 27, 2010 at 8:40pm.

disolving sucrose, NaCl< and calcium chloried affect the boiling point of frezing point of water. Assuming that you have 0.1m solution of all these 3 compounds:
a)rank then in order of decreasing freezing point.
b) rank in order of increasing boiling point
c)why do the affected the boiling point and freezing point of water differently?

  • intro to chem - , Wednesday, October 27, 2010 at 8:49pm

    You should read the posts to see what they say. Yours doesn't make sense but I can guess at what you omitted.
    delta T = i*Kf*molality
    delta T = i*Kb*molality.

    Since molality is the same for all three solution, that is not a factor. Kf or Kb is the same for all three solutions, also; therefore, that is not a factor.
    i is the number of particles. Sucrose has 1, NaCl has 2, CaCl2 has 3. That's the difference. Now you can answer 1 and 2.

  • intro to chem - , Wednesday, October 27, 2010 at 9:05pm

    Thank you Drbo22...but if it dosent make sence I'm sorry but that's what the tearche wrote in the paper he gave us...

  • intro to chem - , Wednesday, October 27, 2010 at 10:01pm

    If the instructor started the sentence with a small letter instead of a capital letter, wrote < instead of a , after NaCl, and misspelled or (of), then shame on him/her. My guess is those are typos in transferring the problem to this board. It would have made all the difference in the world, as I read the post, if you had written Dissolving sucrose, NaCl, or CaCl2 .....
    Even if the instructor wrote it incorrectly, it would have helped if you had corrected it to make your question a little easier to understand. Thanks for using Jiskha and do come back.

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