CHE 327 Study Guide - Quiz Guide: Pinene, Liquidus, Nutmeg
10 Oct 2016
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Volatile liquids vapor pressure at room temp is important. Rotary evaporation exploits volatility of liquids to remove unwanted liquids. Safer than distillation because avoids heating flammable liquids. And avoids heating desired compound above decomposition temperature. Vacuum source pulls vapor away and condenses it. Heating bath maintains evaporation rate and prevents re-condensation of liquid. More rigid molecules that pack into lattice are more stable (higher mp) than flexible ones. Ionic compounds have higher mp i. e. salt vs acid (has higher mp) Hydrogen bonds have higher mp i. e. increasing oh groups. Narrow and far need more data to identify compound. Broad and far impure and not compound. Solid solution solutes become part of crystalline structure of solvent. Mixed melting point - determination of pure product. If pure, then mp will be same range and unaffected. If impure, then mp will be broader and lowered. Mixi(cid:374)g t(cid:449)o solids (cid:449)ith the k(cid:374)o(cid:449)(cid:374) (cid:272)o(cid:373)pou(cid:374)d (cid:271)ei(cid:374)g the (cid:862)sol(cid:448)e(cid:374)t(cid:863) a(cid:374)d produ(cid:272)t (cid:862)solute(cid:863)
