A test TLC plate (silica) using a 1 : 3 mixture of CH₃CN:H₂O as eluent shows that two compounds have R_f values of 0.52 and 0.15:

You plan to use column LC to separate a mixture of the two compounds. How can you attempt to ensure that their behaviour on the column will closely mimic that on the TLC plate?

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R₁ = 0.52 R = 0.15 -T-----