Mass and Energy II

Mass and Energy II. Evidence I: Paper chromatography.

Introduction

Chromatography is an analytical technique commonly used for separating a mixture of chemical substances into its individual components, so that the individual components can be thoroughly analyzed. There are many types of chromatography, for examples: liquid chromatography, gas chromatography, ion-exchange chromatography, affinity chromatography, paper chromatography, etc.  For this experiment, you are going to work with paper chromatography. In this type of chromatography as the solvent (liquid) moves through the paper filter it carries with it the pigments contained in the ink spot, as not all of them are dragged with the same speed, after a while there are colored strips that correspond to the ink components of the marker or pen.  

Materials:

 • Alcohol

 • Water

• Color pens or makers

• Plastic glass

 • Paper towels

 • Coffee filter

Development

Part I: 

1. In a glass add water (until the mark of the glass) 2. Cut the filter paper in rectangles of 4 cm x 10 cm.  3. In one of the extremes of the rectangle, draw a little point with the marker or pen.  4. Put the paper inside the glass with water, make sure that the extreme with ink is in contact with the solvent but the point of ink not. (Figure 1) 5. Wait for the results.  6. Repeat the steps 1-5, with alcohol and two more inks until you complete the next table.

Fig. 1

Part II. Following the same steps of part I, developed two different designs in a coffee filter and take pictures of the procedure and result.  

Examples:

After the experiment, you need to create a report about the results of the experiment, the report should include:

• Names and ID of the members of the team

• A little introduction about the physics concepts involved in the experiment.

• Materials

• Procedure (include pictures/photographs)

 • Results (include pictures of the two parts of the experiment with a little explanation and the table of part I)

• Conclusion

 • Include: what you learned from the experiment, real life applications for capillarity and paper chromatography.

 • Individual opinion about the experiment

• Format:

• Arial 12

 • Margins: 2.5 cm

 • Indentation: 1.5 cm

 Deliver method by email: margarita.morales.cruz@tecmilenio.mx Due date: Thursday, February 8th, 12:00 pm (noon)

Mass and Energy II.

Module 1.

Evidence I: Paper chromatography.

Students Report

Norma Margarita Morales Cruz

Angela Zambrano Fuentes 2828443

Valeria Contreras Domínguez 2796109

Ernesto Leos Saucedo 2798051

February.8.2018

Introduction

Chromatography is a method for separating the elements of a mixture based on the comparative amounts of each solute distributed between a moving fluid stream, called the mobile phase and a contiguous stationary phase. The mobile phase may be either a liquid or a gas, while the stationary phase is either a solid or a liquid. The first realistic application of chromatography was the one of the early dye chemists, who tested their dye mixtures by dipping strings or pieces of cloth or filter paper into a dye vat. The dye solution migrated up the inserted material by capillary action, and the dye components produced bands of different color. In the 19th century, several German chemists carried out deliberate experiments to explore the phenomenon.

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