Eight Solutions Lab Analysis of Unknown Unknown 423

Eight Solutions Lab Analysis of Unknown

Unknown #423 test 1: I am going to test first with lead (II) nitrate because it provides a variety of different reactions

Observation: There was no reaction

Conclusion: The unknown is not: sodium iodide, sodium carbonate, sodium hydroxide. Additionally, it is not copper (II) nitrate or iron (III) nitrate because the unknown is colorless. It could be nitric acid, silver nitrate, or lead (II) nitrate

Hypothesis: (Just pick one of the possibilities) The unknown is silver nitrate Test: Add sodium hydroxide. If the unknown is silver nitrate, the solution will turn cloudy brown.

Observation: White solid formed when sodium hydroxide was added

Conclusion: The unknown is lead (II) nitrate

Additional test confirming the hypothesis that the unknown is lead (II) nitrate: Add sodium iodide. If the unknown is lead (II) nitrate, the solution will turn bright yellow

Observation: When sodium iodide was added a bright yellow solution formed. Conclusion: the unknown #423 is definitely lead (II) nitrate.

Your write up should look like this:

Unknown #423 Test I am going to test first with lead (II) nitrate because it provides a variety of different reactions Observation: There was no reaction Conclusion: The unknown is not: sodium iodide, sodium carbonate, sodium hydroxide. Additionally, it is not copper (II) nitrate or iron (III) nitrate because the unknown is colorless. It could be nitric acid, silver nitrate, or lead (II) nitrate Hypothesis: The unknown is silver nitrate Test: Add sodium hydroxide. If the unknown is silver nitrate, the solution will turn cloudy brown. Observation: White solid formed when sodium hydroxide was added Conclusion: The unknown is lead (II) nitrate Additional test confirming the hypothesis that the unknown is lead (II) nitrate: Add sodium iodide. If the unknown is lead (II) nitrate, the solution will turn bright yellow Observation: When sodium iodide was added a bright yellow solution formed. Conclusion: The unknown #423 is definitely lead (II) nitrate.