Question

Among Gas Chromatography, NMR spectroscopy, and distillation, which is better at identifying the unknown solvents? Which is better at determining % composition? Explain your answers about why is one better than other two and why the other two is not good?

Answer 1

For identifying unkonwn solvents and % of compositions to identify its purities Gas chromatography (GC) is the better compare to other NMR and distillation techniques.

GC is a powerful tool in analysis, speciall y designed for solvents and aliphatic compounds to identify purities, but we have to match with this standars or aunthetic sample.for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture, Industries will prefer to determine solvents and compostions by GC technique (good seperation method with small amount).

NMR method provides information as to the relative positions and numbers of spin active nuclei (e.g. protons, carbons) in a compound,this information is used to identify the structural features of a molecule. we can identify structre easily compare to GC, single solvent identification easy whaere as % of compositions and its purities difficult.

Distillation techique , is a process of separating the solvents or substances from a liquid mixture by selective evaporation, As the boiling point of a solvent will vary with atmospheric pressure, when comparing boiling point values it is important to know the solvent (identification) at which the individual determinations were made.

for identification of unknown solvents, % of compsitions GC is better technique.