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Testing for ions in the water found in a body.

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Testing for ions. Introduction. A body is found in the sea, but the forensic scientist is suspicious and thinks that the murder took place elsewhere and the person has been dumped in the sea. Other possibilities include being drowned in a bath or a local fresh water lake next to a copper mine. Purpose of activity. The purpose of the activity is to find out where the person was first killed by doing tests on different types of water, which she could have died from. Planning. The first thing to do is to test the water in the person's lungs to see what ions we would get, then test the water from the place where she was found and a place where she could have got killed to see what ions we would get, after getting all of the results from the different waters we would have to match the ions we have got from the lungs with the different waters to find out what she really died from. ...read more.


Testing with solutions. 1. Pour approx 3cm depth of control solution into a test tube. 2. Add a few drops of specified solutions. 3. Make a note of any colour changes or precipitates formed. 4. If a gas is produced, bubble the gas through limewater. 2) Flame test. 1. Clean a wire loop in a roaring Bunsen flame. 2. Rinse the wire loop in hydrochloric acid. 3. Dip the wire loop into the test solution or substance. 4. Test the solution by placing the loop back in the roaring Bunsen flame. 5. Make a note of any colour change in the flame. Results. These are the results we got after each chemical we tested. Tested For With Results Lungs Co32 Limewater Milky Lungs Cl- Silver nitrate White precipitate Lungs Na+ Flame Bright yellow Lake Cl- Silver nitrate White precipitate Lake Cu2 Flame Green Lake Na+ Flame Bright yellow Bath Na+ Flame Bright yellow Bath Cl- Silver nitrate White precipitate Bath Co32 Limewater Milky Bath Cu2 Flame Green Conclusion. ...read more.


Modifications. There are a few modifications that would have made the experiment even more successful like - + * Using an un-reactive wire loop like a platinum loop, which is un-reactive at all, which would have given better results to the experiment. * We could have repeated the tests a couple of times to ensure us hat we got a fair result and that we got the right result from the experiment Discussion of vocational Implications. A forensic scienctist would carry out the tests in the same way as we did in school but they would use more reliable equipment for the tests for example they would use a mass spectrometry which is used to get readings of a sample that is put into the machine. When a sample is put into the machine by a sciectist the machine would do tests to find out what they would know what they would be looking for after the test is complete the machine would give out a reading on paper showing what ions where present in the sample. ...read more.

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