In paper chromatography, a compound has an Rf value of 0.4. If the solvent front travels 8.0 cm, how far does the compound travel?
Correct answer: B. 3.2 cm
- A. 2.0 cm
- B. 3.2 cm
- C. 4.0 cm
- D. 8.0 cm
Explanation
Rf distance traveled by compound/distance traveled by solvent. Distance= Rf × solvent distance= 0.4 x 8.0 = 3.2 cm.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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