• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12

Paper chromatography

Extracts from this document...

Introduction

Introduction It is suspected that a rival company producing felt tip pens is stealing ideas for new colour from primary colour, a leading felt tip pen manufacturer. The company requires proof before it starts making allegations and requires you to devise a test to determine whether the colours have been stolen. Somebody on the inside of the rival company has supplied the company with same prototype from the rival company for you to test whether the rival felt tip pen manufacturer is stealing ideas for new colours from the other company. Aim The aim of this coursework is to find if the rival company is stealing the other company's new idea. To determine if they have stolen news ideas for a new felt tip, I well perform to simple tests however effective (paper chromatography and thin layer chromatography). I well reform tests on the prototype and the company's felt tip to see any simulates. Paper chromatography Paper chromatography is one method for testing the purity of compounds and identifying substances. Paper chromatography is a useful technique because it is relatively quick and requires small quantities of material. Paper chromatography is an analytical technique for separating and identifying compounds that are or can be colored, especially pigments. This method has been largely replaced by thin layer chromatography, however it is still a powerful teaching tool. Separations in paper chromatography involve the same ideology as those in thin layer chromatography. In paper chromatography, like thin layer chromatography, substances are distributed between a stationary phase and a mobile phase. The stationary phase is usually a piece of high quality filter paper. ...read more.

Middle

cm 1 Purple 7.8 cm 7.4 cm 0.94 Yellow gave Distance travelled by solvent Distance travelled by colour Rf values Yellow 7.8 cm 7.4 cm 0.94 Thin layer chromatography Thin-Layer Chromatography (TLC) is a simple and inexpensive technique that is often used to judge the purity of a synthesized compound or to indicate the extent of progress of a chemical reaction. In this technique, a small quantity of a solution of the mixture to be analyzed is deposited as a small spot on a TLC plate, which consists of a thin layer of silica gel (SiO2) or aluminum (Al2O3) coated on a glass or plastic sheet. The plate constitutes the stationary phase. The sheet is then placed in a chamber containing a small amount of solvent, which is the mobile phase. The solvent gradually moves up the plate via capillary action, and it carries the deposited substances along with it at different rates. The desired result is that each component of the deposited mixture is moved a different distance up the plate by the solvent. The components then appear as a series of spots at different locations up the plate. Substances can be identified from their so-called Rf values. The Rf value for a substance is the ratio of the distance that the substance travels to the distance that the solvent travels up the plate. Before attempting to apply TLC to the challenging problem of separating and identifying the felt tips, it is advisable to learn and practice the technique by applying it to mixtures that are easily visualized and separated. Inks provide an ideal practice vehicle for TLC because they normally contain several coloured components that separate nicely in common solvents such as water. ...read more.

Conclusion

Secondly, the water that was used in the beakers was not measured so we had two different volume of water in the two beakers, which once again meant that the results might not have been as accurate as it should have been. Thin layer chromatography The first graph shows the results that I got for the pen the company used and the second graph shows the results that I got for the prototype pen, which is from the rival company. After comparing the two graphs I can see that the thin layer chromatography has given a more accurate and I can distinguish that the two results are very corresponding. Thin layer chromatography has given me a more reliable result, which I can say know that the two pens are very identical and say that the rival company has stolen the other company's idea for a new primary colour. In addition, even I used different volume of water I have got an accurate result because TLC was the same size for the two tests I did and also the solvent front was the same measurement, which meant that the water reacted the ink nearly the same time. In conclusion I can say that by analysing the paper chromatography graphs and the thin layer chromatography graphs I articulate that the rival company has stolen their idea for a new primary colour. Risk assessment Glass equipment Beakers: when doing this you well be using three to four beakers and for safety reasons you should not be walking around with the beakers and also make sure that the beaker doesn't role down the table. Fahim Razay 12D Science applied ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Inorganic Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Inorganic Chemistry essays

  1. Peer reviewed

    Deducing the quantity of acid in a solution

    5 star(s)

    This can also affect all the numerical answers. However, as we weighed by difference, these weighing errors were reduced as much as possible. Although the equipment had been cleaned before we used it, it hadn't been sterilised before we did the practical, so the material could have been easily contaminated.

  2. effects Concentration and Temperature on the Rate of Reaction

    Concentration can be changed simply by taking a sample of the original solution and adding distilled water. Where M1 is the molarity of the solution before dilution, M2 is molarity after dilution, V1 is the volume of the solution before dilution and V2 is volume after dilution: V1 = (M2 x V2)

  1. Titration Coursework

    Each time, I will pour the water into the volumetric flask using a funnel. 5. Then I will fill the volumetric flask with water until the bottom of the meniscus is touching the line. In order for me to this correctly, I will fill the water just below the line

  2. Deriving a Solubility Curve

    From the curve, it can be observed that heat increases solubility. An increase of heat causes the water molecules to move around more so they hit the lattice with greater force, and create more disruption of the lattice. This allows for more of the solid to be dissolved in water, which is an increase in solubility.

  1. An experiment to identify substance X using thin layer chromatography.

    Lab coats Prevents staining of clothes. Stools and bags Should be put away, preventing trips and falls. U.V light source The U.V light is strong, so it's important not to look directly at the light source. Hazardous liquids Care must be taken when measuring and the correct procedures must be carried out when cleaning up any spillages.

  2. Gas Chromatography

    The temperature of the sample port is usually about 50?C higher than the boiling point of the least volatile component of the sample. For packed columns, sample size ranges from tenths of a micro liter up to 20 micro liters.

  1. Chemistry Iodine Clock

    = Mr (molecular mass) x Moles We need to work out the molecular mass of Sodium thiosulphate Na2S2O3 Element Mr Sodium (Na) 22.989 x 2 = 45.978 Sulphur (S) 32.065 x 2 = 64.130 Oxygen (O) 15.999 x 3 = 47.997 Total Mr = 158.105 We have the molecular mass now we can work out the mass needed.

  2. Oxidation of ethanol

    As ethanol is flammable, I should ensure that no solution remains in the sink where it might be a fire hazard. For personal protection protective gloves and safety goggles were worn during the experiment. Because of the chemicals used, a window was left open during the experiment in order to assure ventilation.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work