5. What evidence is there that marker ink is a mixture?
6. Each compound in the marker ink is represented by a color. Did one compound travel farther than others? Explain why you think that this is the case.
7. Did the compounds travel farther in water or isopropyl alcohol (rubbing alcohol)? Explain why you think that this is the case.
8. How could you improve upon the accuracy of your R[f] measurements?
i think im going insane not knowing how to answer these questions, ive done research and i still dont get it
I just don't understand why you have a problem. First, I assume yu are talking about a chromatography(maybe paper or silica gel) experiment. Did you do it or is this a dry lab? If you did it, surely you saw a number of spots (and not just one spot) as the ink traveled from the insertion point at the bottom up towards the top. So wouldn't more than one spot tell you that the marker ink was comp;osed of more than one material?
7 & 8. I'll leave these for you but consider the answers to 5 and 6 to help you through these. Of course you observed the difference between the two solvents. Consider that the two solvents have different solubilities, that they are adsorbed to the paper/silica gel in different ways, the hydrogen bonding differs, etc.
6. Were all of the spots in one spot (on top of one another) or were they separated. You can see if they traveled the same distance or not can't you? Why would they travel different distances in the same time. Must be that
each compound of the ink "grabs" the solid material(the paper or silica gel) at different rates? Just a thought.
7.
i think it is made of water and a surten chemical.
To answer questions 5, 6, 7, and 8, it's important to have a basic understanding of chromatography. Chromatography is a technique used to separate and analyze mixtures based on their different components' properties, such as their solubility and affinity for a stationary phase.
1. What evidence is there that marker ink is a mixture?
To determine if marker ink is a mixture, you can perform chromatography. Take a piece of chromatography paper or filter paper and draw a small line at the bottom with a marker. Then, dip the bottom part of the paper into a solvent, like water or rubbing alcohol, making sure not to submerge the line. As the solvent travels up the paper, it carries the components of the ink with it.
If marker ink is a pure substance, you would expect to see only one color move up the paper. However, if it is a mixture, you will notice that different colors separate as the solvent travels up the paper. This separation occurs because different compounds in the ink have different affinities for the paper and solvent.
Therefore, if you observe multiple colors separating and appearing at different heights on the paper, it indicates that marker ink is a mixture.
2. Did one compound travel farther than others? Explain why you think that this is the case.
During the chromatography process, different compounds in the marker ink will separate and travel up the paper at different rates. This occurs because each compound has different solubility in the solvent and affinity for the paper.
If one compound traveled farther than others, it suggests that it has greater solubility in the solvent or a weaker affinity for the paper. These properties can vary based on the chemical composition of the compound or the interactions it has with the paper and solvent.
To determine which compound traveled the farthest, you can examine the height each color reached on the paper. The highest color represents the compound that traveled the farthest.
3. Did the compounds travel farther in water or isopropyl alcohol? Explain why you think that this is the case.
The choice between water and isopropyl alcohol as the solvent will affect how the compounds in the marker ink travel on the chromatography paper. Different solvents have varying polarities and interactions with the components of the ink.
Polar compounds tend to dissolve better in polar solvents, while non-polar compounds dissolve better in non-polar solvents. Therefore, the solubilities of the components in water and isopropyl alcohol will differ.
To determine whether the compounds travel farther in water or isopropyl alcohol, you need to observe the chromatography results. If the colors on the paper show greater separation and reach higher distances with one solvent compared to the other, it suggests that the compounds traveled farther in that particular solvent. This indicates that the chosen solvent was able to dissolve the compounds more effectively or interact with them more favorably.
4. How could you improve upon the accuracy of your Rf measurements?
Rf (retention factor) is a measurement used in chromatography to determine the relative mobility of a compound. To improve the accuracy of your Rf measurements, consider the following:
a) Properly measure and mark the baseline: Ensure that the baseline (starting line) of the chromatography paper is accurately drawn at the same height for each experiment. This consistency is crucial for precise Rf calculations.
b) Use a controlled and uniform solvent system: Maintain the same solvent and its concentration for all experiments to minimize variations. Additionally, ensure the paper is dipped evenly in the solvent to achieve consistent separation.
c) Allow sufficient time for the chromatography to occur: Ensure that the chromatography paper is given enough time for the solvent to migrate up and separate the components effectively. This will help in accurately measuring the distances traveled.
d) Repeat the experiment: Perform multiple runs of the chromatography experiment to observe consistent results. By repeating the experiment, you can identify any potential errors or inconsistencies that may have occurred in a single trial.
e) Measure and record accurately: Use a ruler or measuring device with appropriate precision to measure the distances traveled by the compounds accurately. Small variations in measurement can affect the calculated Rf values.
By following these guidelines, you can enhance the accuracy of your Rf measurements and obtain more reliable data.