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jasmin2344
jasmin2344
31.10.2019 • 
Chemistry

Imagine that you are a supervisor of a laboratory. your group is analyzing a sample of stream water that has high levels of an anion contaminant. you know that the sample contains either chloride, sulfate or carbonate. you have a new student intern and you have them do the analysis of the sample using solutions of sr2+, pb2+ and zn2+. the intern carries out a similar investigation as the one you did in this lab. the results of the reactions between each of the cations with each of the anions is the same as your results. the intern then goes on to do the test on the stream sample. here is an excerpt from the intern’s report about the test on the stream sample.15 drops of stream water was placed in a test tube using a 1 ml plastic pipet. 5 drops of 0.10 m sr2+solution was added to the stream water, one drop at a time, with shaking between each drop to mix the solutions. i observed a white, cloudy precipitate form in the solution. this reaction was the same as the reaction i saw when i did a control reaction between a solution of sr2+ with a solution of so42-. therefore, i conclude the anion in the stream sample is so42-.do you agree or disagree with the intern’s conclusion about the identity of the anion in the stream? provide some constructive criticism of the intern’s work, explaining why you either agree or disagree with the intern’s conclusion. explain what further tests would be needed to convince you of the identity of the anion, or, explain why you are convinced that the intern is correct. ( i need a full answer)

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