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How To Distinguish Between AgNO3 & NaCl

    • 1). Place 5 ml of each unknown solution in a separate test tube.

    • 2). Label each of the unknown test tubes so that you can identify which bottle each solution came from. The labels can be as simple as "solution A" and "solution B." Mark the bottles with the same labels.

    • 3). Add 10 drops of PbNO3 to each test tube. Record any reaction you observe. PbNO3 will exhibit no reaction when mixed with AgNO3; the solution will remain clear and colorless. The addition of PbNO3 to the NaCl solution will form PbCl2 precipitate, however. The precipitate will settle to the bottom as a white powder.

    • 4). Confirm the results of the first test by adding 10 drops of KCl solution to each test tube. The addition of KCl to the AgNO3 forms a white precipitate. After the addition of KCl to the tube containing NaCl, the solution will remain colorless and clear.

    • 5). Tabulate the results of the two spot tests. The solution that showed a positive test with PbNO3 test solution contains NaCl. The solution that showed a positive test with the KCl contains AgNO3.

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