• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Identifying unknown substances. The test that we did was a flame test, negative ion test and a alcohol test. We also did chromatography to find out which technician labelled the bottle.

Extracts from this document...


What's in the bottle? In the experiment we had to find out the name of the entire 3 bottle. The test that we did was a flame test, negative ion test and a alcohol test. We also did chromatography to find out which technician labelled the bottle. Chromatography Chromatography is also known as a paper chromatography. Chromatography identify which type of inks make up a dye How to carry out chromatography 1. wrap a piece of chromatography paper with a stick until the paper touches the beaker 2. Use a rule and a pencil and Draw a thick line on the paper about an inch above the water's edge. Don't use a ink pen because it will absorb the water and the ink will run on the paper 3. Tape the other end of the paper with a stick and clip it with a paper clip 4. place a dot of any colour on the line 5. Fill the cup with water. Not completely, of course, of even near complete 6. full- about half an inch of water 7. ...read more.


Acidify solution with dilute hydrochloric acid then add barium chloride solution White precipitate Hydroxide ( OH-) Add drops of full range universal indicator Dark purple solution formed Testing for alcohol Another way to find out a name of a chemical is to test if it is an alcohol. Alcohol are a group of chemical that are made of carbon, hydrogen and oxygen 1. Get a solution 2. Add a drop of sodium dichromate (VI) 3. place it in a Bunsen burner 4. If the solution turns orange to green it is an alcohol. Names No. of carbon Formula Diagram mass Methanol 1 CH3OH 32 Ethanol 2 C2H5OH 46 Propanol 3 C3H7OH 60 butanol 4 C4H9OH 74 When trying to find the mass of each chemical you need to times the mass of each elements with the number of each element there are present. C mass = 12 H mass = 1 O mass = 16 When using the mass spectroscopy to determine which alcohol is present is to use a graph that shows all the mass of the alcohol and then look at the end of the graph to find the real mass of the alcohol Result: Alcohol test: A ...read more.


We found out that it was an ethanol. Are result was pen 1 was used. Evaluation I think that my result was what i expected. Whiles doing my experiment i followed all the procedures and made sure that i did all the experiment the best of my ability, but there were somet thing that were wrong in the procedures was that whiles heating the test tube for the alcohol, it is was very hard to find the change between the colour. Also it was hard to see the colour different in the flame for example when i was testing bottle B the colour look like orange - red so i did not know the different between sodium or lithium. In the experiment i tryed to see the colour clearly and try to see what the colour represent, therefore i can see what the first part of the name of the 2 bottles. In the experiment, i would like to improve the result because parts of was difficult to see what type of chemical, metal or alcohol it is. The adjustment that i would make use more reliable equipement like a measuring cylinder to make sure that my measuring is checked and that there is no mistake and that i will get the right result at the end . ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials 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 GCSE Classifying Materials essays

  1. Calcium carbonate reacts with dilute hydrochloric acid according to the equation below

    0.35 57.98 0.28 58.64 0.42 105 58.22 0.37 57.93 0.33 58.60 0.46 120 58.16 0.43 57.89 0.37 58.55 0.51 Concentration 29.2g dm-3 Concentration 21.9g dm-3 Mass of marble chips: 10.00g Mass of marble chips: 9.99g Mass of marble chips: 9.99g Time (seconds) Mass (g) Change in mass (g) Mass (g)

  2. Ions - a qualitative analysis on our chemicals by flame testing.

    This increases the chance of effectively rinsing the eyes free of chemicals (harsh streams of water may drive particles further into the eyes). * Eyelids may have to be forcibly opened to attempt eye rinse. * Flood eyes and eyelids with water/eye solution for a minimum of 15 minutes.

  1. Our experiment consisted of two samples of water containing unknown substances, and our objective ...

    Other compounds such as calcium sulphate deposits as well. Since they are bad conductors of heat, more energy has to be used by the boilers just to provide the home owner with the same results as it was before the depositing of calcium carbonate and calcium sulphate.

  2. Identification of an unknown compound.

    Ag+ ? Ag (reduction) ?CHO + [O] ? ?COOH (oxidation) No further chemical tests were carried out. Due to observations during chemical tests, a simple conclusion can be drawn that Compound B is an aldehyde (a carbonyl compound). Another chemical test that could be used to confirm the organic product would be Fehling's solution (solution of copper (II)

  1. Rate of reaction of different concentrations of sodium thiosulphate.

    The five plots on my graph are the mean time that I had done for each concentration. The mean will give me more reliable results as I had done three trials for each of the concentrations therefore a better conclusion.


    of proton present is OH attached to: This is supported by the fact that the hydrogen on the -COOH group is highly electron deficient because of the proximity of the two electronegative oxygens. The NMR spectra illustrates this by the large chemical shift of the -COOH protons at values for S greater then 10.

  1. Gravimetric analysis for Chloride Ion.

    A 0.25 gram sample of unknown 547 was weighed accurately on an analytical balance using a clean, dry weighing bottle. 2. 0.2638 grams of the unknown was transferred into a 250mL beaker and 100mL of distilled water and was added.

  2. An experiment to investigate the factors that determine the amount of energy released when ...

    A small flask may mean that the water is not spread out for the heat to reach it. The size of the conical flask shall be chosen when I choose the correct amount of water to be heated. Measuring out the water There were many different sized measuring cylinders in the laboratory that I could use for measuring the water.

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