DRAFT: This module has unpublished changes.

Discussion/Conclusion:


The purpose of this lab was to identify the anions present in a mixture of solutions. Four common anions were tested in this lab. They include PO42- (Phosphate), Cl- (Chloride), SO42- (Sulfate), and NO3- (Nitrate). At the end of this lab, we were able to conclude that chloride ions were present in the unknown solution. In the first procedure, phosphate and sulfate did not form precipitates and therefore both of these ions were not in the unknown solution. In the second procedure, a test for chloride was administered. A precipitate formed so we knew that the anion in the unknown solution was chloride. This finding was confirmed when the third procedure was done. In the third procedure no brown ring formed which indicated that nitrate was not present. Just like in all labs, there was a chance of error. Contamination could have occured with the many students sharing the chemicals. Also, in the third procedure, the H2SO4 needed to be added at an angle to ensure that the solution would not mix so if there was nitrate, the brown ring cold be observed. If this was not done carefully, layering would not occur and the observer would not see a brown ring. In the future of performing this lab, I would make sure students did not contaminate the chemicals and also that the H2SO4 was added at exaclty a 45° angle. Additional trials are also a good idea to improve the accuracy of the results from a lab.

DRAFT: This module has unpublished changes.