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Testing for ions.

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Introduction

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. By doing this, we should be able to find ions in the person's lung and in the different types of water to help us in our experiment 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 while matching up the different the waters the one that don't match would get eliminated until we get a perfect match. ...read more.

Middle

Make a note of any colour changes or precipitates formed. 4. If a gas is produced, bubble the gas through limewater. 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 Ions present Lungs Co32 Limewater The carbonate turned a milky colour The carbonate ions was present Lungs Cl- Silver nitrate The calcium turned a white precipitate colour The calcium ions was present Lungs Na+ Flame The sodium turned a bright yellow colour The was sodium ions present Lake Cl- Silver nitrate The calcium turned a white precipitate colour The calcium ions was present Lake Cu2 Flame The copper turned a green colour The copper ions was present Lake Na+ Flame The sodium turned a bright yellow colour The sodium ions was present Bath Na+ Flame The sodium turned a ...read more.

Conclusion

We didn't get enough water to test for the ions so that we would have got a better result. The wire loop is quite reactive which interfered with our results. 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 done the experiment a couple of times, which would have also given us better results to the experiment. Discussion of vocational Implications. A forensic scientists 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 scientist 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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