🇮🇴🇳🇮🇨 🇺🇳🇰🇳🇴🇼🇳🇸 🇱🇦🇧
What was this project?We had thirteen unknown substances that we were tasked with identifying.
DataREACTED WITH: SO IT’S: TYPE:
1. We asked who made the reddish one, and they said that it was iron chloride. FeCl3 FeCl3 2. We asked who made the pink one, and they said it was cobalt sulfate CoSO4 CoSO4 3. We asked who made the tinted blue one, and they said that it was copper sulfate. CuSO4 CuSO4 4.No precipitate; it was soluble with anything (property of a nitrate) NO3 Ca(NO3)2 5.Pb & Ba, not Na2CO3 (must contain CO3) CO3 Na2CO3 6. SO4 (solubility guidelines says Al reacts with SO4) Al Al(NO3)3 7. Pb & Ba & Na2CO3 SO4 MgSO4 8. No precipitate NO3 Ba(NO3)2 9. NH4 Cl SrCl2 10. NH4SO4 = precipitate & AgNO3 Zn Zn(NO3)2 11. +Cl = precipitate Ag AgNO3 12. NH4 Cl KCl 13. Pb & Ba SO4 LiSO4 |
What did we do?The solubility guidelines helped us test what should react with what, and based upon that expected reaction, we could figure out what the substance was. The independent variables were the known solutions that we used, and the dependent variables were the unknown solutions, because they reacted depending on the known solution we reacted them with. The control was the reactions that we knew would work, and the constants were the surrounding conditions.
|
Conclusion:
By using the solubility guidelines to form precipitates, we will identify thirteen unknown solutions using the process of qualitative analysis. Upon testing the unknown compounds, we can use the process of elimination to rule out what substances they couldn’t be, based on the reaction. Since we didn’t know 13 solutions, we planned to use the solubility guidelines to tackle this. We familiarized ourselves with the known common reactions between chemicals, and then implemented them. We tested BaCl2, which we knew would form a precipitate with a sulfate to rule out chemicals that were not sulfates. From there, we broke down the formulas of the sulfates we were trying to find, MgSO4 and LiSO4. To further narrow these down, we tried to find a chemical that wouldn’t react with Li, but would react with Mg. Unfortunately, we were unable to find this, so we collaborated with another group who had already figured out MgSO4, so we were able to compare tests to see if it was correct. When we decided it was, we used that process of elimination to label those two chemicals to the right unknown substance. We continued using this method, testing them in accordance to the solubility guidelines, collaborating with another group, and using the process of elimination. For the nitrates, which were soluble with anything, we tried to identify the cation associated with it. This, however, proved very difficult, so we collaborated with other groups to check our group’s work, and by doing that found that Al reacts with SO4, so when one of the solutions formed a precipitate with a sulfate, we knew that it was Al(NO3)2. At the end, it came down to working with other groups to find out our errors or finding new tests, and in the end we were able to identify nine out of thirteen substances.