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→Identifying Chemicals by Rf Number
#Use a ruler to measure the distance that the [[solvent]] has traveled up the paper.
#Use a ruler to measure the distance that the [[chemical]] has traveled up the paper.
#Use the following equationto find the [[Retention Factor]]:
:<math>R_f = \frac{d_c}{d_s}</math>
:Where:
:d<sub>c</sub> = distance moved by the [[chemical]]
:d<sub>s</sub> = distance moved by the [[solvent]]