Experiment #3 - Mixtures and Pure Substances HYPOTHESIS: My hypothesis is that none of the Crayola colors are pure colors because they are a mixture of other color components. PURPOSE: The purpose of the experiment is to determine the specific types of pigments found in water-soluble marker pens by using paper chromatography and water as a solvent. RAW MATERIALS: coffee filter pencil or other rod to use to hang the paper from different colored water-soluble marker pens (Vis a Vis pens and Crayola water soluble work well. Be sure that it is water soluble. Be sure to test any green, water soluble inks that you have.) water glass SAFETY CONSIDERATIONS: • Get foreign particles in your eyes so wear clear safety glasses. • Get cuts from …show more content…
The only noticeable difference was that it nearly traveled to the top of the filter strip with very little signs of pigment separation. CONCLUSIONS: The lab experiment did prove that Crayola colors are not of pure substances but rather a mixture of specific color compounds needed to produce said colors. The experiment also proved that different color pigments have different densities (the lighter ones moved up the filter paper with the water, while the heavier ones adhered to the filter paper longer.) In the second experiment with the green color, I can safely conclude that the color green in this case is very soluble and we would need longer filter paper, perhaps more time to safely separate the different colors that make up the color green. ANALYSIS AND QUESTIONS: 1. In each case, is the ink a pure substance (based on your results)? Why or why not? The inks are not pure substances since the pigments get separated along the filter paper. 2. What observation leads you to believe there is a force of attraction between water
The color that was chose to be shined through the sample was purple. The spectrophotometer was set at a wavelength of 400nm to represent the purple color. It was zeroed using the blank meaning the spectrophotometer read zero as absorbance amount. The blank consisted of 5mL of water and 2.5 mL AVM and it was placed in cuvette. A solution with a known concentration of 2.0x10-4 M was used in the spectrometer.
The distance of the initial extract line to a pigment band was divided by the distance of the marked solvent front to the initial extract line both were measured in cm. The RF (relative to front) was calculated for each pigment band, indicating the travelled distance between the pigment and the front (solvent line) on the chromatography
...for the original titration, shown in Table 5. This could be due to perhaps usage of the wrong indicator, or of not stopping the titration exactly when the color changed.
Before it can be used I had to calibrate the colorimeter. To do this I had to calibrate a colorimeter a cuvette filled with distilled water is placed into the colorimeter, the colorimeter in theory should then give a reading of the absorbance level being 0, this is because the water used in the calibration process is distilled and therefore should give a reading of 0, if not then it shows the equipment being used the experiment is either faulty or inaccurate. As all the light will pass
You really enjoyed using the blue dye, you sprayed a good portion of the paper with your blue dye. Once you had finished using your blue dye you swapped colours with Madison who had the green dye. Moira,
The ground pigments used in pastels are the same ones used in acrylic or oil paints. However, pastels contain a higher pigment concentration than any other painting medium, so they produce rich, luminous colors. Also, since a very weak inert binder is employed, it does not affect the color of the pigment.
A cuvette was filled 3/ 4ths of the way and the absorbance measured in a spectrophotometer. The data was compiled as a class and recorded. The Spectrophotometer was blanked using a test tube of distilled water.
The materials I used for this experiment are a one ounce of red food coloring , four ounces of water and one tablespoon of cocoa powder, I used these materials to make fake blood. I also used a ruler, newspaper, plastic, a
The experiment started by labeling a piece of filter paper with my initials with the following A, B, C, oil, and H2O. I placed two drops of each unknown milk sample, vegetable oil, and H2O next to the labels on my filter paper and allow to air-dry. After these samples were dried, I placed the filter paper in a petri dish containing Sudan IV solution and stained the filter paper for one minute. I then used the forceps to remove the filter paper to the rinsing dish. Then, I rinsed the filter paper with water and collect the runoff in the dish. The last step, I placed the filter paper on the table and allowed it to
By doing this experiment, I can know the physical and chemical properties of these samples. After I get my results about the physical and chemical properties of these samples, I can compare my results with the information given by the past student and identify the 5 unknown samples, finding out which sample is which substance. Hypothesis = ==
The three dyes formed, one in each emulsion layer, are the subtractive primaries yellow, magenta and cyan. All silver is then bleached out and each layer is left with a positive color image.
This experiment demonstrated the ability of agarose gel electrophoresis to separate the mixture of dyes into their individual components by the application of a combination of dyes to the same sample well. The experiment effectively demonstrated that the dyes where different in structure, energy, and composition. Most of the dyes where negatively charged at neutral pHs and only one with positive charge. The positive charge one moved an opposite direction compared to the other dyes.
Ever since that cloud disappeared crayons were no longer made in clouds. People on factories started making them in all sorts of colors. Factories started making them so then the crayons could do what they wanted and they didn't have to listen to any rules. And that is how the different colors of crayons were made. Now there are many different colors of crayons all because of the crayons on the clouds that were tired of listening to the
Regardless of how competent the artist is, he will most likely begin the work with a light graphite sketch. Using a soft lead pencil will allow the artist to erase easily and will not engrave pencil marks into the relatively soft paper. The ink will completely cover the pencil marks and any graphite in the watercolor can be erased or will barely be noticeable.
1. The labels have fallen off of three bottles thought to contain hydrochloric acid, or sodium chloride solution, or sodium hydroxide solution. Describe a simple experiment which would allow you to determine which bottle contains which solution.