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Anion Test- Testing for negative ions in solutions.. Applied science unit 3 (AQA)

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´╗┐Anion Test- Testing for negative ions in solutions. Equipment: * Pipette * Test tube * Test tube rack * Goggles * Chemicals: Chloride, Sulphate, Carbonate, Dilute nitric acid, Silver nitrate solution, Hydrochloric acid, Barium chloride solution Hypothesis: I will test unknown solutions to find out if they are a Sulphate, Carbonate and Chloride. I would check for the negative ions in order to check for substance present. Method: To start, first of all I would design a results table to record my results in during the experiment, then I would put on my goggles this is to ensure my safety whilst handling hazardous/dangerous substances such as Chlorides. Then I would collect the correct equipment needed for this experiment this includes collecting test tubes, chemicals etc. When I have collected my equipment then I would set it all up such as putting my test tubes in the test tube holder, I would use a pipette to get the chemicals and put them in the test tube for testing. Then I would start the experiment and doing the tests, for example if I was to test for a Chloride I would first add a few drops of dilute Nitric acid then add a few drops Silver nitrate solution. ...read more.


Put the test tubes in a test tube holder which makes them secure and stops them from falling also you should handle test tubes with care to stop them from falling as well. First of all you should alert all the students and the teacher then clean it up. If you cut yourself with it then you should place your cut place under the tap and get a plaster if needed. Medium http://rjneeley.files.wordpress.com/2011/06/test-tube.jpg Silver Nitrate (Silver Nitrate is toxic as well as corrosive) If the Silver Nitrate solution comes into contact with your skin may cause irritating and burns. If the Silver Nitrate gets into the eyes then it could cause very serious burns and could cause long term eye problems such as severe corneal injury. In some cases it can change the colour of your skin permanently. You should handle the chemical with care to reduce the chance of it affecting your skin. To protect your eyes form getting affected you should wear goggles. Rinse with plenty of water to remove the substance from clothes, to protect it from happening again you should try to change your clothes if possible. ...read more.


White precipitate. Carbonate CO32- Add a few drops of dilute nitric acid or dilute hydrochloric acid. Bubbles of carbon dioxide gas are given off. Sulphate SO42- Add a few drops of dilute hydrochloric acid followed by a few drops of barium chloride solution. White precipitate. Conclusion: Using my hypothesis I was able to identify substances. I was able to find out if they were a Carbonate, Sulphate or a Chloride. My results support my Hypothesis because it was correct. Evaluation: To make my experiment more accurate I would first make sure that I do precise measurements instead of just adding in solutions. Secondly to get more reliable results I would repeat my experiment to make sure that I got the correct results. Limitations: The first limitation of the anion test is that you need to use a large amount of sample to get the correct result. This makes the experiment unfair because for some chemicals you might have to add more than others. Some of the mixtures give difficult results which makes the experiment unreliable because it will be hard to identify the correct the correct element/compound. ...read more.

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