Separations by partition chromatography depend on partitioning of a mixture\'s c

Question

Separations by partition chromatography depend on partitioning of a mixture's components between two solvents - a stationary phase on a solid support and a moving phase. What is the solvent of the stationary phase in paper chromatography? The solvent of the stationary phase is adsorbed onto the surface of a solid support. What is the solid support in paper chromatography? The mobile phase in partition chromatography can be a single solvent or a mixture of solvents depending on the particular separation desired. In the paper chromatography of food dyes (today's exercise), what is the composition of the mobile phase? Is the mobile phase more polar or less polar than the stationary phase? Explain your answer in terms of nonbonding attractive forces. There are seven FDA certified food colors, but McCormick Food Colors & Egg Dye contains only FD&C; Yellow US. FD&C; Red #40. FD&C; Blue #1. and FD&C; Red #3. (The food colors also contain water, propylene glycol, and 0.1% propyl paraben (as solvent, humectant. and preservative, respectively.) What is the common name of each of the following colors? FD&C; Yellow 5 FD&C; Red 40 FD&C; Blue I FD&C; Red 3

Explanation / Answer

(1) The solvent in stationary phase is the water trapped between the cellulose fibres in the paper.

(2) Cellulose fibres of paper

(3) An alcohol and acetone mixture

(4) In general moblie phase is less polar than stationary phase.

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