Question
Paper CHROMATOGRAPHY is carried out on a mixture. One of the COMPONENTS travelled 2.5 cm and the SOLVENT travelled 8.7 cm. The Rf value is... (2.5)/(8.7)=0.29 8.7-2.5=6.2 (8.7)/(2.5)=3.48 8.7+2.5=11.2
Answer
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Charlie
Professional · Tutor for 6 years
Answer
`2.5/8.7=0.29`
Explanation
Chromatography is an important laboratory technique employed to separate a mixture into its individual components. It uses two phases: one stationary phase (paper in Paper Chromatography) and one moving phase (solvent). Components in the mixture move along the stationary phase with the flow of the solvent. Different components will travel different distances due to varying molecular interactions with the paper and solvent. The Rf (Retention or Retardation Factor) is the ratio of the distance traveled by a component to the distance traveled by the solvent. It is a characteristic property for each particular substance and a considered measure for how far the substance has traveled under set conditions. Since the component travelled 2.5cm and the solvent travelled 8.7 cm, the equation used to calculate the Rf value is: distance traveled by the component (2.5cm) divided by the distance traveled by the solvent (8.7cm).