Anions Lab

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What Metals and Anions Are in the Water?
Objective:

The objective of this experiment is to determine what metals and anions present in the water sample given to us.

Introduction:

Water quality is one of the most important things us humans don’t appreciate. One of the biggest things that are tested at water treatment plants is to ensure the water supply has a safe concentration of metal ions. Although regulations have become more stringent, metal ions will be present in the water supply due to natural and industrial sources. Anions are also very important in today’s water supply. In this experiment we performed tests on 5 metal ions and 4 anions. After recording the observations we then identify the unknown anions and metal ions in the …show more content…
Once you are positive that your two identification schemes will work, you obtain and sample of an unknown metal ion and a sample of an unknown anion. In our case it was Chicago as our unknown metal ion and China as our unknown anion. You then test your scheme by creation your own mixture and adding 5 drops of each cation to a test tube. After added all the unknown and known substances to the test tube you should be able to identify the presence of all five cations. If you are unable to identify your cations you will need to go back and modify your scheme. Once completed you will need to record your observations and determine which of the five metal ions are present.

Results:

Unknown (Metal Ions): NaCl 2M NH3 6M NH3 H2SO4 …show more content…
Our reasoning behind this was the identification scheme. When we added NaCl to the unknown solution known as Chicago we did not get the reaction PbCl2. We then added 2 M of NH3 and once again did not get the reaction Cu(OH)2(s). After adding 2 M of NH3 we added 4 more M of NH3. We found that when we added more NH3 we did get a reaction from iron. After adding NH3, we added H2SO4 and got a reaction from barium. Lastly, we added Na2C2O4 as the last cation to react and got calcium as the third and last metal ion found in Chicago. In the unknown sample labeled “Chine” we found that the only anion present was SO4^2-. Our reasoning behind this was the identification scheme used for unknown anions. Firstly, when we added BaCl2 we got a white precipitant as a reaction. This then led us to going down the identification scheme telling us the reaction is now HNO3. Once we saw the reaction and that no bubbles were formed we added AgNO3. When there once again was no reaction, we concluded that the unknown anion present in this reaction was SO4^2- also known as
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