Organic Chemistry - Melting Point

posted by .

You have an unknown with an observed melting point of 90-93°C. Is your unknown compound A with a reported melting point of 95.5-96°C or compound B with a reported melting point of 90.5-91°C? Explain.

  • Organic Chemistry - Melting Point -

    I would think your compound is compound A. Compound A with a small amount of impurity will cause it to have a lower melting point in the range of your m.p. AND to be less sharp. I wouldn't think it would be compound B because the melting point of your unknown is ABOVE mp of compound B and your unknown as range not nearly as sharp as A or B. Impurities cause mp to be lower, not higher.

  • Organic Chemistry - Melting Point -

    The compound is most likely to be A.This is because Sample A containing little impurities will cause a reduction in its melting point not an increase as it would apply for Sample B.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. organic chem/ melting pt lab

    why does a soluble impurity reduce the melting point range of a pure compound ?
  2. Chemistry

    Student in O-Chem Lab conducts a melting point experiment with an unknown compound and observes a melting range of 210 – 218C. Is this a typical range for a melting point?
  3. Chemistry

    student perform 2 melting point determinations on a crystalline product. In one determination, the tube contained a sample 1 - 2 mm in height, and the melting point was 141 - 142 ¢ªC. In the second determination, the sample hight …
  4. Chemistry

    you were asked to determine the melting point of an unknown compound in order to identify at as one of the compounds you had previously examined. What else could you have done to make sure that your unknown was indeed the compound …
  5. chemistry

    Melting point experiment: how do i know the calibration curve?
  6. chemistry

    this is what my lab report looks like (minus the graph of the first part) im stuck on part II I. A. unknown 1 melting point range (uncorr) 50.0-53.0 melting point range (corr) 50.2-53.2 (because of graph from part 1 of experiment) …
  7. organic chemistry

    A sample of Compound X is analyzed and found to have a melting point range of 110-120 °C. Would you try to purify it further to get a sharper melting point?
  8. Organic Chemistry

    Why is the melting point of a known compound (ex. acetanilide) determined before the melting point of the unknown compound?
  9. chemistry

    Say you have two substances, A and B. A has a melting point of 300 degrees Celcius, while B has a melting point of 200 degrees Celcius. If you took a mixed melting point where the ratio of A is higher than B, what would the melting …
  10. Organic chemistry

    An unknown compound (x) melts at 60°C and is mixed with a compound (y) that melts at 45°C and is soluble in x. Will the Melting point for the mixture start below 45°?

More Similar Questions