1. Use the experience you gained from doing the experiment to answer the following:A student tested an unknown mixture that might contain any of the ions tested in this experiment

and made the following observations: a. On the addition of 6M HCl, the solution remained colorless and no bubbles were observed. b. When 0.1M BaCl2 was added to the acidified unknown, a white precipitate was formed. c. When 0.1M AgNO3 was added to the unknown, a white precipitate was formed. d. When 1M Na2C2O4 was added, a white precipitate formed. On the basis of the test results, which ions are likely present in the unknown?