CHEM 221 Study Guide - Final Guide: Elution, Benzene, Fractionating Column
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Ans)1- fractional and simple distillation are almost the same except in fractional distillation there is a fractionating column which is placed between the boiling flask and the condenser. There are small plastic or glass beads inside the fractionating column, to improve the separation. Ans) like other forms of chromatography, there is a stationary and mobile phase in gas chromatography too. Mobile phase is usually a gas, can be called as carrier gas. Stationary phase can be solid or liquid, packed inside a metal or glass tubing called a column. When a mixture of substances is injected at the column inlet, each component is carried towards the detector by the mobile carrier phase. Q3) a gc chromatograph of toluene benzene mixture is taken. Toluene peak has an area of 2. 5, whereas benzene has an area of 1. Mass % = peak area of a substance / total area * 100. Mass % of toluene = 2. 5/3. 5 *100 = 71. 4 %
