Question
Hi,
I am unsure what the manual book is asking to do.
Do I compare the values from the manual book and my experiment value?
I did a simple distillation lab in the class and collected the data including boing point, melting point, refractive index, and density.
Thank you very much for your help!
EXPERIMENT 3 Distillation to sep at have ent. EXPERIMENTAL PROCEDURE Estimated time for the experiment: 2.0 h Physical Properties of Components Compound Ethyl acetate trans 1,2-Dibenzoylethylene 236.27 50 m Reagents and Equipment. Transfer 1 mL of the yellow stock solution (trans-1,2-dibenzoylethylene/ethyl acetate, 50 mg/mL) to a 3-mL conical vial Amount mp (°C) bp(C) 88.12 1.0 mL 77 0.90 1.3723 Level automatic delivery pipet (remember to place the vial in a small beaker to by prevent tipping during the transfer). Place a boiling stone (or a magnetic spin e if desirable) into the vial and assemble the Hickman still head. The still assembly is mounted in a sand bath on a hot plate (see Fig. 6.2). Experimental Conditions. The temperature of the bath is raised to 90-100C van at a rate of 5 °C/min. CAUTION: Do not let the temperature of the still rise too rapidly Once boiling commences, the rate of heating should be lowered to the point where the temperature increases at 2-3 C/min. A slow distillation rate is very important in establishing equilibrium between the vapor and liquid com- ponents in the mixture. Follow the course of the distillation by the rise of con- densate on the sides of the Hickman column. When the condensate reaches the trap, adjust the bath temperature so that liquid is removed from the col- umn slowly (-100 3 min). A smooth, slow distillation will provide a cleaner ni tive of fect ify An Clamp Thermometer or Clamp 14/103 Hickman still head O-ring 14/103 and threaded Clamp Thermometer 90-100 °C compression cap 3-mL conical vial Crystallizing dish Boiling stone Sand Hot plate Magnetic stirrer Stir Heat control Figure 6.2 Hickman still (14/10 3 with conical vial [3 mLI). trans-1,2-Dibenzoylethylene/ethyl acetate (50 mg/mL), 1 mL
Explanation / Answer
You need to do the following things
1 - you have determined the refractive index, compare your experimental value with the manual book. If the difference is more than 0.0010 unit then find which experimental value deviates most from the experimental value.
2 - you have determined the density, compare your experimental value with the manual book.
3 - you have determined the boiling point (Tb) , compare your experimental value with the manual book (T) and check
If Tb = T, then the fraction is pure component
If Tb is not equal to T, then the fraction is not pure.
4 - you have determined the melting point , compare your experimental value with the manual book.
5 - finally make a table of comparison between experimental values and manual book values and submit it.
