Lab #7 Report Chemical

Lab #7 Report Chemical

Lab #7 Purpose: The purpose of this experiment is to analyze known solutions of Ba(NO3)2, Ca(NO3)2, Mg(NO3)2 and Sr(NO3)2 (alkaline earths) and known solutions of NaBr, NaCl and NaI (halogens). Then we are given an unknown solution to determine what ions are present. Materials: 1. Test tubes 2. Test tube holder 3. Pipet 4. 1 M H2SO4 5. 0. 1 M Na(NO3)2 6. 0. 1 M Ca(NO3)2 7. 1 M Na2CO3 8. 0. 25 M (NH4)2C2O4 9. 0. 1 M KIO3 10. Bromine water 11. Chlorine water 12. Iodine water 13. 0. 1 M NaCl 14. 0. 1 M NaBr 15. 0. 1 M NaI 16. Unknown (E) Methods:

Alkaline Earths 1. Wash the test tubes of any residue 2. Add 12 drops of 1m H2SO4 to four test 3. Then add 12 drops of 0. 1m Ba(NO3)2 to one test tube containing 1M H2SO2 4. Add 12 drops of 0. 1m Ca(NO3)2 to another test tube containing 1M H2SO2 5. Add 12 drops of 0. 1m Mg(NO3)2 to another test tube containing 1M H2SO2 6. Add 12 drops of 0. 1m Sr(NO3)2 to the final test tube containing 1M H2SO2 7. Observe and take notes on the precipitate or the lack of precipitate in each reaction 8. Clean the test tubes after taking notes . Repeat the procedure, but now with 12 drops of 1m Na2CO3 in each test tube 10. Add 12 drops of 0. 1M Ca(NO3)2 to another test tube containing 1M Na2CO3 11. Add 12 drops of 0. 1M Mg(NO3)2 to another test tube containing 1M Na2CO3 12. Add 12 drops of 0. 1M Sr(NO3)2 to the final test tube containing 1M Na2CO3 13. Observe and take notes on the precipitate or the lack of precipitate in each reaction 14. Clean the test tubes after taking the notes 15. Repeat the process with 12 drops of 0. 25M (NH4)2C2O4 16.

Observe and take notes on the precipitate or the lack of precipitate in each reaction 17. Clean the test tubes after taking the notes 18. Repeat the process with 12 drops of 0. 1M KIO3 19. Observe and take notes on the precipitate or the lack of precipitate in each reaction 20. Clean the test tubes after taking the notes 21. Repeat the process with 12 drops of unknown (E) 22. Observe and take notes on the precipitate or the lack of precipitate in each reaction and deduct if it’s Ba(NO3)2, Ca(NO3)2, Mg(NO3)2 or Sr(NO3)2. 23. Clean the test tubes after taking the notes

Halogens 1. Place a few drops of bromine water into the test tube and add 12 drops of heptane and shake 2. Repeat the process with chlorine water and iodine water and note any color changes in each 3. Clean the test tubes after taking the notes 4. Get three test tubes and add 12 drops of bromine water to each test tube with 12 drops of HEP 5. Add 12 drops of 0. 1M NaCl to the first test tube, 12 drops of 0. 1M NaBr to the second test tube and 12 drops of 0. 1M NaI to the third test tube 6. Note the color of each reaction 7. Clean the test tubes after taking the notes . Repeat the steps but with 12 drops of chlorine water in each test tube with 12 drops of HEP 9. Observe the color of each reaction 10. Clean the test tubes after taking the notes 11. Repeat the steps but with 12 drops of iodine water in each test tube with 12 drops of HEP 12. Observe the color of each reaction 13. Clean the test tubes after taking the notes 14. Repeat the steps but with 12 drops of unknown (E) in each test tube with 12 drops of HEP 15. Observe the color of each reaction and deduct if the unknown is either NaBr, NaCl or NaI Results:

Alkaline | H2SO4| Na2CO3| (NH4)2C2O4| KIO3| Ba(NO3)2| Cloudy white| Very cloudy white| White precipitate sits on bottom| Tiny amounts of white precipitate| Ca(NO3)2| No reaction | Cloudy white| Cloudy white precipitate| No reaction| Mg(NO3)2| No reaction| White film on top| No reaction | No reaction| Sr(NO3)2| White precipitate on top| White cloudy solution with some white precipitate| Faint white cloudy foggy precipitate| Little amounts of tiny white precipitate| Unknown (E) | No reaction | White film on top| No reaction| No reaction| .

Unknown Alkaline Earth: Mg(NO3)2 Reaction between Halogens and Halides | NaBr| NaCl| NaI| Unknown (E)| Bromine water| Light faint yellow| Golden yellow| Faint yellow tint| Light faint yellow| Chlorine water| Dark yellow amber | Colorless| Light yellow| Dark yellow amber| Iodine water| Light yellow tint| Dark red color| Light yellow| Light yellow tint| Unknown Halogen: NaBr Color of Halogens in solution | Br2| Cl2| I2| Water| Orangey-Brown| Colorless| Brown| HEP| Orange| Colorless| Purple | Conclusion: