Post-Lab Questions
Directions: Answer the following questions, show work for all calculations. Work must be shown to receive credit for calculations. All questions are weighted equally.
- Based on your recorded observations, which cation(s) were present in your unknown solution? Provide your unknown number and a clear explanation of how your results match the known reaction patterns.
- Were any of your unknown’s results ambiguous or unexpected? If yes, which reagent produced them and how did you resolve the uncertainty?
- A solution is tested with Na₂SO₄ and produces no ppt, but when tested with Na₃PO₄, it forms a white ppt. Based on the solubility rules and your lab experience, which cation is most likely present? Explain.
- Describe one procedural error that could lead to false positive precipitate formation in a well. How could you avoid it?
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If you were given an unknown solution and told it contained either Ag+, Na+, or Pb2+, describe a step by step procedure you would use to identify which ion is present based on solubility rules.
Licenses and Attribution
CC Licensed Content, Original
This educational material includes AI-generated content from ChatGPT by OpenAI. The original content created by Carol Stallworth from Hillsborough Community College is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
All images in this textbook generated with DALL-E are licensed under the terms provided by OpenAI, allowing for their free use, modification, and distribution with appropriate attribution.
