37.8g of water to give a freezing point of -.15 degrees C

  1. Hey, I really need help in my chem homework. :(

    how many grams of ethyl alcohol CH2OHCH2OH must be added to 37.8g of water to give a freezing point of -.15 degrees C.
     
  2. jcsd
  3. symbolipoint

    symbolipoint 3,038
    Homework Helper
    Gold Member

    Re: Chemistry?

    One must either find this information in a handbook or conduct a determination experimentally. I may suspect that doing the determination experimentally could be difficult, since freezing of a liquid is being watched for. Anybody have a guess, would the solution turn turbid near or at the freezing point? One would want to gently agitate the solution during cooling to uniformly distribute the temperatures.
     
  4. Borek

    Staff: Mentor

    Re: Chemistry?

    I guess it is just about cryoscopic constant. What is cryoscopic constant for water? What molality of ethanol do you need?
     
  5. Re: Chemistry?

    Once you have the molality, check you don't mean ethane-1,2-diol, (ethylene glycol), rather than ethanol - the two have different molecular weights, and so will generate different masses...
     
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