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Testing for ions

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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 bath or a local fresh water lake next to a copper mine. What the forensic scientist has to do is do a test to see if he is correct or if he is wrong. Planning The two tests I had to carry out to do this test were Testing with solutions and Flame test. In the experiment I had to find out what ions were in the water these are my results. Sea water Na+ = Sodium K+ = Potassium Ca2+ = Calcium Cl- = Calcium So4 2- = Sulphate Co3 e- = Carbonate Lake water Ca2+ = Calcium Cu2- = Copper Cl- = Chloride Bath water Na+ = Sodium Co3 2 = Carbonate Safety Points 1. One safety point that you should consider is to wear goggles because you use dangerous ions in the test and when you put them in the flame they could flick off and go in to some ones eyes. ...read more.


When we tested the lake water it did not have Na+ in it which was in the lung water. Also we tested a second ion which was Cl- this was in the lake and also in the lung water. The last ion that we tested was Cu2- this was in the lake water but was not in the lungs which made it clear that she had not been drowned in the lake water the lake water also had one more ion than the lung water which made it 100% correct. We also tested sea water because the body was found in the sea. The sea water had Na+ in it the lung water also contained Na+. Then we tested for Cu 2- which was not in the sea water and was not in the lung water. The sea water did not have Cl- and Co3 2- which was in the lung water this showed that the body was drowned in the sea water. The last water we tested was bath water the first ion we tested for was Na+ this was in the bath water and also in the lung water. ...read more.


The human errors that I could have had are first of all I could have not been following the procedure properly and do the wrong thing in the experiment which would change my results that I get. Another human error that I could have had is when I was doing the flame test I may have not put enough substance on the wire loop which would give a different colour that would change the result in the test. I did not have any design errors and did not find any. Discussion of vocational implications A forensic scientist would carry out the test in a different manner. He/She would do it in a laboratory and would a protective suit and gloves so they do not contaminate the sample or catch any dieses from the sample. They also would use more sophisticated equipments like we used a different metal wire rod to the platinum that they would use in the laboratory. This would give forensic scientist more better results than the ones that we got. Ahraz Ashraf 10N ...read more.

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