Organic Chemistry

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Compound A is recrystallized from n-propanol. Given are the following solubilities (in 100 mL of solvent): 160 g/100 °C, 100 g/80 °C, 60 g/60 °C, 20 g/20 °C, 15 g/10 °C and 10 g/0 °C. How many milliliters of solvent are needed to dissolve 80.0 g of compound A during the recrystallization?


800 mL
134 mL
400 mL
50 mL
80 mL

  • Organic Chemistry -

    At what temperature do you wish to start? That will be dictated partially by the melting point of compound A as well as the boiling point of n-propanol. For example, (but you don't want to use this one), if we use the 100 C data,

    100 mL x (80/160) = 50 mL. However, you don't want to use this one because n-propanol boils < 100 C. In fact, if you will look at the data, every possible answer is there using the formula,
    100 mL x (80/table value) = ??
    Therefore,
    100 mL x 80/160 = 50 mL
    100 mL x 80/100 = 80
    100 mL x 80/60 = 133
    100 mL x 80/20 = 400
    etc.
    Look at your notes and in the lab preparation material, as well as the melting point of compound A to make your choice.

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