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Chem

Analysis

QuestionAnswer
Thin Layer Chromatography Stationary phase - adsorbent surface (e.g silica) Mobile phase - Solvent Solute spotted with capillary tube, solvent rises up TLC plate, solute adsorbs at different distances, spots often visualised with UV, Rf calculated (solute/solvent)
Gas Chromatography Stationary phase - High boiling liquid adsorbed to inert solid Mobile phase - Inert gas carrier Components carried in gas, more soluble in liquid = longer the time to reach detector, Rt recorded, conc found by comparing area with calibration curve
Test for alkenes Add bromine water Decolourises - Orange to colourless
Test for haloalkanes Add silver nitrate and ethanol in a 50C water bath Chloroalkane = white precipitate Bromoalkane = cream precipitate Iodoalkane = yellow precipitate
Test for phenols Ph indicates an acid but no reactivity with carbonates
Test for carbonyls Add 2,4 - DNP Orange precipitate
Test for aldehydes Add Tollen's reagent and warm Silver mirror
Test for primary and secondary alcohols and aldehydes Add acidified Potassium dichromate in a warm water bath Colour change from orange to green as it is oxidised
Test for carboxylic acids Add an aqueous carbonate (e.g sodium carbonate) Effervesence
Created by: silver54331
 

 



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