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If the Rf factor of a pigment is .8400 and the distance that the solvent traveled is 12 cm how far did the pigment travel?
To find how far the pigment traveled, you would multiply the Rf factor by the distance the solvent traveled. Distance traveled by pigment = Rf factor x Distance traveled by solvent Distance traveled by pigment = 0.8400 x 12 cm Distance traveled by pigment = 10.08 cm. Therefore, the pigment traveled 10.08 cm.
Would you expect RF number of a pigment to change if we altered the composition of the solvent why or why not?
No, the solubility of the pigment molecule in its organic solvent is a factor involved in the separation of pigments. More soluble molecules move faster and generally travel further. Chlorophyll B is a great example since its only soluble in fat solutions.
What would happen to the pigment spots if the chromatogram was left running for a long time?
If the chromatogram is left running for an extended period, the pigment spots may continue to separate as the solvent carries them further along the stationary phase. This could lead to increased resolution between the different pigments, but if left too long, the spots may become too diffuse and potentially merge into one another. Additionally, excessive time might cause the solvent front to reach the end of the chromatogram, resulting in a loss of resolution and clarity.
What separation technique would be used if a solvent were saved?
If a solvent were to be saved, the separation technique most likely used would be evaporation. This method involves heating the solution to turn the solvent into vapor, leaving behind the solute. It is effective for separating a solvent from a solute when the goal is to recover the solvent for reuse. Additionally, distillation could also be employed if the solvent and solute have significantly different boiling points.
What is the solvent and solution in tincture of iodine?
The solute would be iodine, and the solvent would be tincture
Would you expect the Rf value of a pigment to be the same if a different solvent were used Explain?
The Rf value would not be the same for every solvent as there are factors that allow each solvent to be unique. The attractive force, particle size and solubility of each solvent will create different results each time.
If the Rf factor of a pigment is .8400 and the distance that the solvent traveled is 12 cm how far did the pigment travel?
To find how far the pigment traveled, you would multiply the Rf factor by the distance the solvent traveled. Distance traveled by pigment = Rf factor x Distance traveled by solvent Distance traveled by pigment = 0.8400 x 12 cm Distance traveled by pigment = 10.08 cm. Therefore, the pigment traveled 10.08 cm.
Would you expect RF number of a pigment to change if we altered the composition of the solvent why or why not?
No, the solubility of the pigment molecule in its organic solvent is a factor involved in the separation of pigments. More soluble molecules move faster and generally travel further. Chlorophyll B is a great example since its only soluble in fat solutions.
How would the Rf value for each pigment change if your chromatography strip was twice as long?
If the chromatography strip is twice as long, the Rf values for each pigment would remain unchanged, as Rf (retention factor) is a ratio of the distance traveled by the pigment to the distance traveled by the solvent front. This means that even if the strip is longer, both the pigment and the solvent would travel proportionally further, resulting in the same Rf values. However, the overall separation of pigments might improve, allowing for clearer resolution between different pigments.
What would happen if you submerge the chromatography paper above the pencil line?
Submerging the chromatography paper above the pencil line would cause the solvent to rise above the line, potentially leading to the ink or pigment above the line to dissolve and be carried upwards with the solvent. This can result in the separation of different components within the ink or pigment.
Would you expect any sexually mature plant to be an albino?
No, as chlorophyll reflects green light and is an essential pigment for plants.
Why can the pigment spot on chromatography paper not be submerged in solvent?
The pigment spot on chromatography paper should not be submerged in solvent because it will result in spreading and mixing of the pigments, making it difficult to distinguish them. Instead, the solvent should be allowed to slowly travel up the paper by capillary action, separating the pigments based on their solubility and mobility.
How would you expect Rf values to change if you went from hexane-ethyl acetate solvent system to ethyl acetate only?
If you switch from a hexane-ethyl acetate solvent system to ethyl acetate only, you would expect the Rf values to decrease. Ethyl acetate is a more polar solvent than hexane, so compounds will interact more with the solvent and have shorter distances of travel on the TLC plate, resulting in lower Rf values.
How many square feet at 1 mil thickness will 1 gallon of paint cover?
It depends on the percent of solids. To simplify this, after all the liquid (solvent) part has evaporated, the pigment (solids) is what remains. One gallon of paint having 100% pigment (solids) or no solvent in it, will cover 1600 square feet at 1 mil thickness. If one gallon of paint has 50% pigment (solids) and 50% liquid (solvent), then one gallon of paint would have a net or dry film of 800 square feet.
What method would you use to separate the component colour of a leaf?
To separate the components of a leaf's color, you can use a technique called chromatography. In this method, you would extract the pigment from the leaf using a solvent and then separate the components based on their solubility and molecular size. This allows you to identify the different pigments present in the leaf.
How would you expect the intrinsic volume for a polymer in a particular solvent to vary with temperature?
generally, a polymer gets dissolved in a solvent (which implies lower density and higher volume). the higher the temperature, the quicker the process, so to answer: the intrinsic volume for a polymer in a particular solvent increases with the temperature.
What would happen to the pigment spots if the chromatogram was left running for a long time?
If the chromatogram is left running for an extended period, the pigment spots may continue to separate as the solvent carries them further along the stationary phase. This could lead to increased resolution between the different pigments, but if left too long, the spots may become too diffuse and potentially merge into one another. Additionally, excessive time might cause the solvent front to reach the end of the chromatogram, resulting in a loss of resolution and clarity.
