Paper Chromatography Lab Report
As defined by the Encyclopædia Britannica Paper chromatography is used to separate "dissolved chemical substances". An example of dissolved chemical substances could be the pigments that make up a specific color, for example in a marker. When a chromatography paper experiment is done on a black marker, the experiment tends to separate all the different pigments that make up the color. In this experiment, the substance investigated was a black water soluble Giotto marker pen. Paper chromatography has two phases, the mobile phase and the stationary phase. ChemGuide states that the mobile phase "flows through the stationary phase and carries the components of the mixture that we want to separate with it". The mobile phase carries the different
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ChemWiki defines cohesive forces as the intermolecular forces between molecules of the same kind. In paper chromatography experiments we can see the cohesive forces in the solvents. And adhesive forces are defined as the forces between different kinds of molecules. In paper chromatography the adhesive forces can be seen between the molecules of the solvent and the water molecules found in the chromatography paper. ChemWiki explained that for capillary action to occur the aspdgedice forces have to be stronger than the cohesive forces. For the solvent (alcohol) to rise along the chromatography paper it's adhesive forces between the water molecules in the chromatography paper has to be stronger that the cohesive forces between the molecules of its own kind. The website HyperPhysics explains to us that surface tension occurs when the molecules of a substance don't have molecules of the same kind all around them, and thus they will tend to have stronger cohesive attractions with the molecules that are nearby them. When they cohesive force becomes stronger with the molecules that can be found nearby, the surface forms a "film" as described by the definition in the HyperPhysics website and this film makes a kind of barrier in the surface of the
ChemWiki defines cohesive forces as the intermolecular forces between molecules of the same kind. In paper chromatography experiments we can see the cohesive forces in the solvents. And adhesive forces are defined as the forces between different kinds of molecules. In paper chromatography the adhesive forces can be seen between the molecules of the solvent and the water molecules found in the chromatography paper. ChemWiki explained that for capillary action to occur the aspdgedice forces have to be stronger than the cohesive forces. For the solvent (alcohol) to rise along the chromatography paper it's adhesive forces between the water molecules in the chromatography paper has to be stronger that the cohesive forces between the molecules of its own kind. The website HyperPhysics explains to us that surface tension occurs when the molecules of a substance don't have molecules of the same kind all around them, and thus they will tend to have stronger cohesive attractions with the molecules that are nearby them. When they cohesive force becomes stronger with the molecules that can be found nearby, the surface forms a "film" as described by the definition in the HyperPhysics website and this film makes a kind of barrier in the surface of the