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Homework Help: Qualitative Solubility Predictions

  1. Nov 28, 2008 #1
    1. The problem statement, all variables and given/known data
    Which solvent would be a better choice to dissolve each of the following?
    Tetracholride or Water
    a - thiamine hydrochloride
    b - CH3(CH2)16CO2H
    c - C6H12
    d - CS2
    e - NH3
    f - (NH4)(CH3CO2)

    2. Relevant equations
    Draw the structure and find polarity
    Like dissolve like

    3. The attempt at a solution
    I know water is polar, so will be soluble with other polar molecules
    I know tetrachloride is nonpolar, soluable with non polar.

    a - thiamine hydrochloride - Polar b/c Vitamin B and C are water soluable, and structure
    b - CH3(CH2)16CO2H - Polar b/c CO2H end of chain
    c - C6H12 - non polar
    d - CS2 - non polar because structure
    e - NH3 - polar
    f - (NH4)(CH3CO2) - polar b/c CH3CO2

    Clearly I have gone somewhere as the answer is wrong. I really don't know if F is right. And also B because it is a long chain of C-H which are not polar.
    I have also tried with B and F as non-polar and thats wrong too.
  2. jcsd
  3. Dec 1, 2008 #2


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    Science Advisor
    Homework Helper
    Gold Member

    I assume that you must get all of them right or the program marks the entire problem as wrong.

    Only one of your answers is wrong, not two. 'F' is ammonium acetate... a salt. Polar or non-polar?
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