Magic marker inks, writing homework help

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Science

Description

NO PLAGIARISM NEEDS TO BE ORIGNAL WRITING 

Introduction:

Magic marker inks are often mixtures of several compounds.  Paper chromatography is a common method of separating various components of a mixture. After separation, you can observe the different colors that make up a particular color of magic marker ink. 

You can also calculate a ratio Rf, which compares how far each compound traveled to how far each solvent (substance that dissolves another substance) traveled during the experiment.

Rf = Ds/Df

Ds = Distance traveled by the compound

Df = Distance traveled by the solvent

Materials:

coffee filter, tape, isopropyl alcohol (rubbing alcohol), water, 3 different color magic markers (not permanent); 3 identical tall, narrow drinking glasses; metric ruler, 3 pencils

Pre-lab Questions:

  1. List one extensive and one intensive property of marker ink.
  2. Define mixture.
  3. Is tap water a heterogeneous or homogenous mixture?  Explain your answer.
  4. Is isopropyl alcohol (rubbing alcohol) a heterogeneous or homogenous mixture?  Explain your answer.

Procedure: 

  1. Cut 3 strips of coffee filter. Be sure that the strips are much narrower and slightly taller than the drinking glasses.
  2. In the center the strips, about 3 cm from one end, place a dot of the marker to be tested.  The dots should be about 0.2 cm in diameter and dark enough to be clearly visible.
  3. Place about 2 cm of water in each glass.
  4. Tape the unmarked end of each strip to the center of a pencil so that the strip hangs down when the pencil is held horizontally.
  5. Carefully insert the strips into the glasses, dotted end down.  The dot must be above the water, and the sides of the coffee filters cannot touch the sides of the glasses.
  6. Let the setup stand for 20 minutes. Follow procedure 8 as your setup stands.
  7. Record your observations after 20 minutes in the table below. Measure Df (in cm) for the solvent. Measure the Ds (in cm) for each color that you see on the coffee filter (there may not be three). Calculate the Rf for each color using the equation in the Introduction section. 
  8. Repeat steps 1–7, except place about 2 cm of isopropyl alcohol (rubbing alcohol) in each glass instead of water

Data:

Post-Lab Questions:

  1. What evidence is there that marker ink is a mixture?  
  2. Each compound in the marker ink is represented by a color. Did one compound travel farther than the others? Explain why you think that this is the case.
  3. Did the compounds travel farther in the water or the isopropyl alcohol (rubbing alcohol)? Explain why you think that this is the case.
  4. How could you improve upon the accuracy of your Rf measurements?

Grading Guidelines for Chromatography: Separating Mixtures

Total score for data table    /6

Pre-lab Questions: 2 pts each                               Total score for Pre-lab Questions   /8

Post-lab Questions: 2 pts each                           Total score for Post-lab Questions   /8

 Total score   /22


NO PLAGIARISM NEEDS TO BE ORIGNAL WRITING 


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Explanation & Answer

Attached.

Running head: PAPER CHROMATOGRAPHY OF MAGIC MARKER INKS

Paper Chromatography of Magic Marker Inks
Student’s Name
Institution
Date

1

PAPER CHROMATOGRAPHY OF MAGIC MARKER INKS
Purpose of the Experiment
Paper chromatography refers to a method used to test the purity of compounds and also
identify substances. It is usually used in separating the compounds that forms up a mixture
Colburn (2004). The aim of this laboratory experiment is to find out the several compounds that
make up the mixtures of the magic marker inks through the use of paper chromatography.
Answers to the Pre-Lab Questions
Question 1 #Answer
According to Colburn (2004), the marker inks have both the intensive and extensive
properties. To start with extensive properties of a marker inks refers to properties or variable that
varies when the sample changes. Intensive property on the other hard refers to properties that do
not change.
Question 2 #Answer
A mixture is defined as any material that comprises of two or more substances that are
physically combined.
Question 3 #Answer
A homogeneous mixture refers to a mixture in which there is uniformity of its
composition and the all the solution has the same properties (Moon, 1980). A heterogeneous
mixture which its components can be seen as t...


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