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Question

How will you separate the color components of a mixture of red and blue ink?


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Solution

Step 1 Understanding the concept:

  • Chromatography: It is a technique for separating the components of a mixture.
  • There are two phases to it: one that is stationary and the other that is mobile.
  • The stationary phase is a porous solid (filter paper, while the mobile phase is the liquid into which the mixture is added for chromatography.
  • Paper Chromatography is used to separate the colored components in a mixture of red and blue inks.

Step 2 Explanation:

  • Apparatus Required: Gas jar, glass rod, filter paper strip, jar cover,
  • Requirement:
    Red and blue inks, as well as alcohol and distilled water, were used to create this piece.

Procedure:

  • Draw a line above 3 cm of one end of a Filter paper ( Whatman strip with a pencil (20 x 2 cm).
  • Draw a second line lengthwise from the paper's center.
  • Using a fine capillary tube, place a drop of a red and blue dye mixture at a fixed position. Let it dry outside in the sun.
  • Apply a second drop to the same spot and let it dry. Repeat the process a couple of times more until the area is well-mixed.
  • Suspend the filter paper vertical in a gas container containing the solvent (eluent) using a glass rod, keeping the pencil line (and the spot) about 2 cm above the solvent level over the container with a lid, and leave it alone.
  • It's worth noting the increasing solvent level as well as the mix of red and blue inks.
  • Once the solution has risen around 15 cm, you'll notice two different patches of blue and red on the filter paper.
  • Take the filter paper from the jar and make a note of how far the solvent has risen on the paper with a pencil. This is referred to as the solvent front.
    The paper must be thoroughly dried before using it. In the blue and red spot centers, make pencil marks.

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