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a student is given a lab sample thant contains one of the ions listed below. after...

a student is given a lab sample thant contains one of the ions listed below. after adding a few drops of Ba(NO3)2 solution to a portion of the unknown sample,the student observed a precipitate. Based on this observation, what is the possible ion in the sample

A cl- b br- c c2h3o2- d co3^2- e CH-

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