# Chromotography

• Created by: Mich112
• Created on: 02-11-18 18:30

## How to you complete a chromotography experiment

• Cut the paper so that it doesn't reach to bottom of an empty beaker
• Fasten a piece of paper to a pencil or splint
• Draw a pencil line about 2cm from the bottom of the paper
• Drop a sample of each colouring on the pencil line and let it dry
• Label the samples on the paper using a pencil
• Put about 1cm depth of solvent into the beaker
• Put the paper into the beaker so that the end of it just dips into the solvent
• Leave the paper in the solvent until the solvent has nearly reached the top of the paper
• Remove the paper from the solvent and use a pencil to mark where the solvent ahs reached
• Allow the paper to dry, then measure the distance between your original pencil line and the line the solvent reached
• Measure the distance of each spot from the orignal pencil line
• Calculate the Rf value for each substance in the dyes by dividing the distance each substance has travelled by the distance the solvent has travelled
• Compare the Rf values of different substances to try to identify them

Rf = Distance moved by ink ÷ Distance moved by solvent

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