1. Qualitative Analysis Chem 1106 Lab 19

2. QA Process of determining if a chemical is present or not NOT how much only the presence Changed form 5 to 3 anions and 3 cations in the unknown

3. QA 2 lab periods to do this Independent work Individual data and report

4. QA First week is a process of data collection Run many experiments and write observations The more accurate the data collection the better Think about what could be the compound that would be causing the change. Since this is the information you need for the unknown

5. NaCl(aq) + AgNO3(aq)  NaNO3 (aq) + AgCl ↓ If this happens in the unknown then the cation would be silver

6. QA Ions react in predicable ways –Based on solubility rules form ppt –Forms gas –Color changes –pH changes

7. QA Salts are cations and anions CuCl NH4CH3OO CuSO4

8. QA Ay 12 salts to create a database A reaction matrix Ions and cations are listed in your handout That are possiblities

9. QA Group 1 soluble, ppt of alkali metals will not occur why? All NH4+ are soluble- not option on this lab why? NO3- also not possible as all are soluble are soluble

10. QA OH insoluble expect group1, X reacts with NH4OH and NaOH forms ppt the X can not be alkali metal so NA ruled out. Cl, Br, I are soluble, except Ag, Hg, Pb If you to X add Cl with HCl white ppt forms has to be one of the three cations and Cl is not one of the anions CO3, PO4 and S are insoluble except Group1 no info because both are out Sulfites soluble, Ca and Ag in soluble

11. QA Ba and Pb are insoluble, since the cation is Pb or Ag then sulfites are not our unknown You have only the pipets given do not mix them up rinise them well with DI water before starting Use the matrix as your plan Work carefully and records all information

12. QA Second week NO collaboration from any source except your notes from the matrix and your knowledge of chemsity

13. QA Day two 4 stock solutions –Determine the cations –All in water so must be water soluble Unknowns So think today.