My name is
Jessica Diplan. I attend chemistry class during fifth period. Fifth period
students began to work on our lab on October 15, 2013. The objective was to create a process for separating a mixture, specifically an ink mixture.
Pre-Lab:
1.)What colors are mixtures? There are numerous colors that are mixtures. For example,we have pink(red+white), purple(blue+red), green(blue+yellow),and black (primary colors).
2.)What substances could be used to separate a mixture? Substances such as water, bleach, alcohol, and acetone could facilitate the process.
3.)What is paper chromatography ? Paper chromatography is defined as the
separation of mixtures into their constituents by preferential adsorption by a
strip of filter paper.
Procedure: 1.)Using the ruler, cut the filter paper into long, rectangular strips, about 3 cm x 10cm. *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 alcohol
4.)Pour rubbing alcohol into a plastic cup to a depth of ½ 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 solution for the same marker.
Hypothesis:
1.)Are colors used to mix other colors? Yes. Blue and yellow mix to create green.
2.) Can mixed colors separate into its component colors? Mix colors are able to, due to methods like chromatography. As the solvent diffuses, it will drag whatever is dissolved in it along with it. 3.) Can blank separate into its component colors? Black will separate into its component colors. During the procedure,the pigments that are dissolve easier in water will move faster.
Data Table:
Analysis& Conclusions:
1.) What appeared on the filter paper? Describe all results.
In regards to each of the solvents, they started to move up the strip carrying the ink pigments with it. The bleach and water demonstrated minimum to no results. After additional minutes, the water strip gradually separated a diminutive blue streak. However,the bleach strip remained the same. In contrary,the alcohol and acetone produced conspicuous results. As the indigo pigment continued ahead, the alcohol solvent caused it to diffuse. In order to view additional separations among the ink, my group also used acetone. Immediately, the acetone caused notable changes. After six minutes more colors scattered on the strip. 2.) What did the results indicate about the black ink? *What classification of matter could you give the ink? The results indicate that the black ink is composed of a combination differential pigments.Furthermore, due to the lack of excessive color spreading, I concluded that the molecules of the pigment were small. I would classify the ink as a liquid, due to it's interaction with the solvents.
3.) Is chromatography a useful separation method for ink mixtures? Explain based on your results.
Chromatography is an applicable method for separating ink mixtures, due to beneficial aspects of it. Firstly, it required moderate and low-cost supplies. Secondly, although the separations I observed were meek, I was still able to learn much from the experiment. For example, I learned that black is actually a mixture,additionally it is composed of brighter pigments, such as blue and red.
4.) If you could alter the experiment to test another condition or factor, what would you change or test? If I could amend the experiment to test another condition,I would add more solvents to the filter and for a longer period. For example, additional water could have facilitated the process.As the water moves through the filter, it would carry the color along with it.As the faster molecules separated, more colors would appear.
Post Lab:
How does paper chromatography work? What do the results tell us?
Preferential adsorption of chemical compounds (gases or liquids) in an ascending* molecular-weight sequence.
