Contaminated test solution was the huge problem that caused many confusions when performing especially the flame test for Group C. By using a lot of chemical in this experiment, glassware was easily contained contaminated solution if it was not washed completely. Cations that were not completely removed after separating also caused the incorrect result for the other tests. Conclusion: The identities of the unknown cation in unknown sample #64 were confirmed to be Lead (II), Iron (III), Strontium (II), Nickel (II), Magnesium, and Zinc. These results were concluded by the positive results in each specific test for a particular cation. The observations of the unknown sample were also compared to the observation from the known sample in order to
compared the color of the precipitates. Possible sources of error included the contamination of the solution containing group C and D when performed the test. Group C ions could be left in the supernatant after centrifuging which led to the confusion on identifying Group D ions. This experiment could be improved by carefully wash the precipitate remained after centrifuging, and re-centrifuge the supernatant in order to confirm the uncontaminated solution for another test.
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