4 Suggest how the student could use chromatography to show there were four colours in the printer ink. [1 ma __

## Step 1:Chromatography is a technique used to separate the components of a mixture based on their different rates of travel through a medium under the influence of a solvent.## Step 2:To demonstrate the presence of four colors in printer ink, the student needs to prepare a chromatography setup. This involves a strip of chromatography paper, a container with a small amount of solvent (e.g., water or alcohol), and the printer ink sample.## Step 3:The student should apply a small drop of printer ink to a baseline near the bottom of the chromatography paper. The baseline should be marked lightly with a pencil.## Step 4:Place the paper strip in the container with the solvent, ensuring that the ink spot is above the solvent level. The solvent will travel up the paper by capillary action, carrying the ink components with it.## Step 5:As the solvent ascends the paper, different components of the ink will travel at different rates, separating into distinct bands of color.## Step 6:Once the solvent front has nearly reached the top of the paper, remove the strip and mark the solvent front with a pencil. Allow the paper to dry.## Step 7:Observe the paper for distinct color bands. The presence of four distinct bands will indicate the presence of four different colors in the printer ink.### Important Formula:### \(R_f \text{ (Retention factor) } = \frac{\text{Distance traveled by the substance}}{\text{Distance traveled by the solvent front}}\)## Step 8:The student can calculate the values for each color band by measuring the distances traveled by the substances and the solvent front. This helps in identifying and comparing the separated components.#