Question

New research shows that a red food colouring with an R value of 0.62 (when a particular solvent and temperature are used) could be dangerous to certain people. Samples of food colouring from two different red sweets were collected and the chromatogram bolow was produced. For each of the sweets, state and explain whether or not you would recommend that the sweets are taken off the market based on this research, ​

Answer 1

It is recommended only for the second type of candy to be taken off the market.

Based on the background information, if a candy shows a 0,62 Rf value in the chromatography it is considered potentially dangerous, and therefore it should be taken off the market.

The Rf value is calculated using the following formula:

• Rf =  Total distance traveled by a component/ Total distance from the pencil line to the solvent front

Now, let's find out if any of the components has an Rf equal to 0,62.

Note: To determine the distances I measured the image using a ruler and you can do the same, this will not alter the results.

1. Sample 1

• Total distance traveled by the component: 6cm
• Total distance: 7 cm
• Rf : 6 cm/ 7 cm = 0.85

     2. Sample 2

• Total distance traveled by the component: 4.34cm
• Total distance: 7 cm
• Rf : 4.34 cm/ 7 cm = 0.62

This means sample 2 has the 0.62 Rf value and therefore it needs to be taken off the market.

Learn more about chromatography in: brainly.com/question/10296715