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More soluble components move farther up the paperRetardation factor Rf =  distance traveled by solutedistance traveled by solvent
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Thin-layer
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Alumina (Al2O3), silica (SiO2) as stationary phase
https://lh7-us.googleusercontent.com/eVPazYnkIDHBY6dKhVhCpFeiqV-UzxN9zhZPeA1sFP4ChHWeW9eFlIsZFe2cZwARB0XKhZBUHfo1LnZk8-ZwaxStX4HSR7FjL2wR0zjqVEkkiN2xfun8CKm7Edl8XUYlzLNEQEm3YppefagY0feydWY
Liquid column
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Solvent poured down the column Components in the mixture separate into bands
https://lh7-us.googleusercontent.com/GoL0SPLeLOgKWDXLnucsJmukK4sLOkX0cuG84ZGiym4KB6CZAJsrUHSqbLK5o4MrxRXJK9GyPdzswow9iqm70VurGZzc_IQg3GhrMM-Gq4A7emGJp_v6jw5FjqlLp1N4kUbOuPxR7YAudeSAZpVekNQ