Pre-lab:
Lab objective: create a process for separating a mixture, specifically an ink mixture.
#1.) What colors are mixtures? Pink (red and white), green ( blue and yellow), purple (blue and red), and orange (yellow and red).#2.) What substances should be used to separate a mixture? Alcohol , bleach water, water, and acetone.
#3.) what is paper chromatography? Chromatography is a method for analyzing complex mixtures by separating them into the chemicals from which they are made.
*www.yesmag.bc.ca/projects/paper_chroma.html
Hypothesis questions:
#1.) Are colors mixed to make other colors? Yes, colors are mixed to make other colors for example red and white are mixed together to make the color pink.
#2.) Can mixed colors separate into their components colors? Yes, colors can separate into their components colors using paper chromatography.
#3.) Can black separate into its component colors? Which colors will separate out? Black can separate into its components colors depending on the type of black ink you are using because some black inks do not separate but, the ones that do separate will separate into colors like blue, purple, red, and etc.
Procedure:
#1,) Using the ruler, cut the filter paper into long, rectangular strips, about 3 cm x 10 cm *You need 2*#2.) Measure 0.5 cm from the bottom of the paper strip and draw a horizontal line with your pencil across the width of the strip. Then, use the black marker to make a dot on the pencil line.
#3.) Tape the paper strip around the pencil so that the very bottom of the strip touches the alcohol.
**Do not let ink dot touch the alcohol
#4.) Pour rubbing alcohol into a plastic cup to a depth of 1/2 cm. Then, rest the pencil on the rim of the cup so that the end of the pencil strip with the ink mark is just barely in contact with the alcohol.
#5.) Observe for about 8 minutes.
#6.) Let the strip dry by taping it to a piece of paper provided. Put group names, period, and ipod # on the sheet.
#7.) Repeat the process for the other solutions for the same marker.
Data table:
Data:
Analysis and conclusion questions:
#1.) What appeared on the filter paper? Describe all results.
Nothing really appeared on the filter paper as you can see on the pictures above. The only thing that happened was that the filter paper absorbed the solution in the cup.
The results indicated that the black expo marker does not separate and the classification of matter that I would give the ink would be a homogeneous mixture because I was not able to see the other components of the ink.
#3.) Is chromatography a useful separation method for ink mixtures? Explain based on your results.
Based on my results I would say that chromatography is a useful separation method for certain ink mixtures only because it was not useful for the expo marker my group used but it did work for those who used a sharpie marker.
#4.) If you could alter the experiment to test another condition or factor, what would you change or test?
If I could alter a factor of my experiment I would have changed the fact that we used a expo black marker instead of a sharpie one because the sharpie markers actually gave results unlike the expo marker my group used.
Post-lab:
How does paper chromatography work? What do the results tell us? Paper chromatography works by preferential adsorption of chemical compounds (gases or liquids) in an ascending molecular-weight sequence. The results basically tell us what the mixtures components are by separating the mixture.
By: Alanie Quiles
5th period chemistry
