ID: C 9. In gas chromatography analysis of an unknown misture, the area of the peaks on the chromatogram a. Can be used to directly identify the various components of the mture. b. Can identify which component is more volatile c. Can not give any useable information for an unknown mixture d. Can be used to calculate the mole percents of the components Short Answer Read each question carefully. Answer briefly, but completely. Some?estions may require more in depth responses than others 10. Explain the difference between simple disillation and fractional distallation 11. What is the parpose of using the technique of crystalliration in an organic synthesis? 12. Would Methyl Orange be more soluble in water or in ethyl ether? Explain why Solution 9) d is correct. The area under the curve is generally proportional to the amount of analyte in the sample. In a mixture of components based on the area under the peak amount of each component can be calculated. 10) Dstillation is process a process of sepating chemical compounds from each other by heating the mixture at thier boiling points. If the difference in boiling points of the components are more the the distillation is called simple distillation. Ex: distillation of water and ethanol If the difference in the boiling points of components is very close then the frational distillation is used. Ex: Distillation of petroleum chemicals. 11) Crystallization is a process of purification of synthesized organic compound. Crystallization can be done by dissolving compound in a solvent followed by heating at certain temperature and finally cooled in a freezer. During Crystallization unwanted impurities are dissolved in the solvent and can not combine with compound during Crystallization. Crystallization process is used to form well organized single crystals for XRD measurement to identify the structure. 12) Methyl orange is more soluble in water It is a polar molecule which can be found in the sodium salt form. Salts are more soluble in polar solvents like water compared to non polar solvents like ether. .

1. ID: C 9. In gas chromatography analysis of an unknown misture, the area of the peaks on the
chromatogram a. Can be used to directly identify the various components of the mture. b. Can
identify which component is more volatile c. Can not give any useable information for an
unknown mixture d. Can be used to calculate the mole percents of the components Short Answer
Read each question carefully. Answer briefly, but completely. Some?estions may require more in
depth responses than others 10. Explain the difference between simple disillation and fractional
distallation 11. What is the parpose of using the technique of crystalliration in an organic
synthesis? 12. Would Methyl Orange be more soluble in water or in ethyl ether? Explain why
Solution
9) d is correct.
The area under the curve is generally proportional to the amount of analyte in the sample. In a
mixture of components based on the area under the peak amount of each component can be
calculated.
10) Dstillation is process a process of sepating chemical compounds from each other by heating
the mixture at thier boiling points.
If the difference in boiling points of the components are more the the distillation is called simple
distillation.
Ex: distillation of water and ethanol
If the difference in the boiling points of components is very close then the frational distillation is
used.
Ex: Distillation of petroleum chemicals.
11) Crystallization is a process of purification of synthesized organic compound. Crystallization
can be done by dissolving compound in a solvent followed by heating at certain temperature and
finally cooled in a freezer. During Crystallization unwanted impurities are dissolved in the
solvent and can not combine with compound during Crystallization.

2. Crystallization process is used to form well organized single crystals for XRD measurement to
identify the structure.
12) Methyl orange is more soluble in water
It is a polar molecule which can be found in the sodium salt form. Salts are more soluble in polar
solvents like water compared to non polar solvents like ether.