CSULB ochem 223A lab final review 2024/2025

CSULB ochem 223A lab final reviewTLC stationary phase - correct answer - silica gel, very fine powder; highly polar - stationary phase more polar than mobile phase TLC liquid phase - correct answer - le solvent TLC uses - correct answer - establish two compounds are identical - determine # of components in a mixture - determine the appropriate solvent for a column- chromatographic separation - check effectiveness of saperation - monitor progress of rxn TLC steps - correct answer 1. injection: spot the TLC plate; sample applied to plate 2. separation: development or "running" the plate; as the solvent ascends the plate 3. UV light TLC solvents - correct answer 1. CH2Cl2 & toulene: good choice of solvents for a wide variety of functional groups 2. hexane & petroleum: good choices for hydrocarbon materials 3. More polar materials may require ethyl acetate, acetone, or methanol TLC choice of solvent - correct answer - solvent that causes spots to move with solvent front is too polar - solvent that does not create movement in any material is not polar enough