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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.

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Introduction

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.

Middle

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.

Conclusion

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.

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