[lubbug]

I don't need someone to write the whole procedure out.
But I need help on the steps and more specifically a lay out please.
I especially don't get how to "Use crystallization to isolate the major organic solid from the minor"
The other 2 goals, I only need help briefly.

Also for the result part, can you tell me what numbers go in there?
please explain!

Also, will the two neutral organic compounds the ones that I compare my unknown to? or will this be given?

thank you


Crystallization and Melting Point

Given: 0.070 g of a solid mixture containing two neutral organic compounds (~ 95:5 ratio).

Chemicals: 95 ethyl alcohol & two standards with similar melting points to your unknown

Goal #1: Use crystallization to isolate the major organic solid from the minor. Determine percent recovery.

Goal #2: Prove that you purified the mixture by taking a melting point of both the starting mixture and the isolated product.

Goals #3: Determine the identity of your unknown by comparing it to the two standards


Results & Data (fill this in as you obtain the information)
Mass of Starting Mixture: _____________
Mass of Isolated Product: _____________
Percent Recovery: _____________
Percent Recovery Calculation:
M.Pt of Starting Mixture: _____________
M.Pt of Isolated Product: _____________
M. Pt of standard ___: _____________ (this will be provided for you in lab)
M. Pt of standard ____: _____________ (this will be provided for you in lab)
M.Pt product & standard ___: _____________
M.Pt product & standard ___: _____________
Identity of product: ______________ Explain why:

[orgopete]

Let us assume your two compounds do not have an identical solubility in any given solvent. Then if you dissolve them, one will be more likely to remain in solution than the other. If you start with 0.070 g of a mixture and recover 0.035 g, what is your percent recovery? If you recovered 0.070 g, would you expect the melting point to improve (to be higher)?