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In a qualitative analysis using paper chromatography, which factor primarily aff

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Question: In a qualitative analysis using paper chromatography, which factor primarily affects the Rf value of a substance?

Options:

  1. Solvent polarity
  2. Temperature
  3. pH of the solution
  4. Molecular weight

Correct Answer: Solvent polarity

Solution: 

The Rf value is primarily affected by the polarity of the solvent used in paper chromatography, as it influences the interaction between the stationary phase and the analyte.

In a qualitative analysis using paper chromatography, which factor primarily aff

Practice Questions

Q1
In a qualitative analysis using paper chromatography, which factor primarily affects the Rf value of a substance?
  1. Solvent polarity
  2. Temperature
  3. pH of the solution
  4. Molecular weight

Questions & Step-by-Step Solutions

In a qualitative analysis using paper chromatography, which factor primarily affects the Rf value of a substance?
  • Step 1: Understand what Rf value means. Rf value is the ratio of the distance traveled by the substance to the distance traveled by the solvent front.
  • Step 2: Know that paper chromatography uses a stationary phase (the paper) and a mobile phase (the solvent).
  • Step 3: Recognize that the polarity of the solvent affects how well substances move on the paper.
  • Step 4: Realize that if the solvent is very polar, it will interact more with polar substances, allowing them to move further.
  • Step 5: Conversely, if the solvent is less polar, polar substances will not move as far, affecting their Rf value.
  • Step 6: Conclude that the polarity of the solvent is the primary factor that affects the Rf value of a substance in paper chromatography.
  • Rf Value – The Rf value (retention factor) is a measure of how far a substance travels in relation to the solvent front in chromatography.
  • Polarity – Polarity refers to the distribution of electrical charge over the atoms in a molecule, affecting how substances interact with the stationary and mobile phases.
  • Stationary Phase – The stationary phase is the phase that does not move in chromatography, typically a solid or a liquid supported on a solid.
  • Mobile Phase – The mobile phase is the solvent that moves through the stationary phase, carrying the analytes with it.
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