01 Experiment Basic Chemistry
- 1. Prepared by: Conrad Chong, 2013 Page 1 Experiment: Identification of Metal Ions and Inorganic Compounds by Their Chemical Reactions In this experiment, one should take note of any physical evidence that a chemical reaction is taking place. Such physical evidences include the formation of a precipitate, change in color of the solution or precipitate, evolution of a gas, change in odor, change in pH, and absorption or evolution of heat. A precipitate is a solid that forms due to a chemical reaction and is not soluble in the solvent (in this case, the solvent is water). For simplicity purposes, the latter three evidences of a chemical reaction will not be taken note of. For the evolution of a gas, this will be seen as formation of bubbles, either fizzing similar to soft drinks or merely just the appearance of bubbles at the top of the liquid. Take note also of the color of the original solutions. Materials and Apparatus: Test tubes Test tube rack Droppers 0.1M HCl Labels Markers Test solutions I: 0.1M BaCl2 0.1M MgCl2 0.1M Pb(C2H3O2)2 0.1M CoCl2 0.1M FeCl3 0.1M CuSO4 0.1M AgNO3 0.1M ZnSO4 0.1M NiSO4 0.1M FeSO4 0.1M Al2(SO4)3 0.1M CaCl2 0.1M CdSO4 0.1M SrCl2 0.1M MnSO4 Test solutions II: 0.1M K2CrO4 0.1M K2C2O4 0.1M Na2CO3 0.1M Na2SO3 0.1M NaOH 6M NH3 Procedure: 1. Place 5 drops of the 16 test solutions I into separate test tubes. Add drop wise 0.1M K2CrO4 to each test tube. 2. Place 5 drops of the 16 test solutions I into separate test tubes. Add drop wise 0.1M K2C2O4 to each test tube. If a precipitate forms, add drop wise 0.1M HCl. 3. Place 5 drops of the 16 test solutions I into separate test tubes. Add drop wise 0.1M Na2CO3 to each test tube. If a precipitate forms, add drop wise 0.1M HCl. 4. Place 5 drops of the 16 test solutions I into separate test tubes. Add drop wise 0.1M Na2SO3 to each test tube. If a precipitate forms, add drop wise 0.1M HCl. Perform this reaction in a fume hood. 5. Place 5 drops of the 16 test solutions I into separate test tubes. Add drop wise 0.1M NaOH to each test tube. If a precipitate forms, add drop wise more 0.1M NaOH. 6. Place 5 drops of the 16 test solutions I into separate test tubes. Add drop wise 6M NH3 to each test tube. If a precipitate forms, add drop wise more 6M NH3. References: 1. Stanton B, Zhu L, and Atwood CH. 2010. Experiments in General Chemistry featuring Measurenet: Guided Inquiry, Self-Directed, and Capstone, 2nd ed. Brooks/Cole, Cengage Learning, Belmont, pp. 75-110. 2. Beran JA. 2011. Laboratory Manual for Principles of General Chemistry, 9th ed. John Wiley & Sons, Inc., Hoboken, pp. 53-60.
- 2. Prepared by: Conrad Chong, 2013 Page 2 Experiment Data Sheet Name: Date: #1-#2 Color of Solution +K2CrO4 +K2C2O4 +HCl BaCl2 CuSO4 FeCl3 FeSO4 Al2(SO4)3 CaCl2 CdSO4 SrCl2 MnSO4 Pb(C2H3O2)2 ZnSO4 NiSO4 CoCl2 AgNO3 MgCl2 #3-#4 +Na2CO3 +HCl +Na2SO3 +HCl BaCl2 CuSO4 FeCl3 FeSO4 Al2(SO4)3 CaCl2 CdSO4 SrCl2 MnSO4 Pb(C2H3O2)2 ZnSO4 NiSO4 CoCl2 AgNO3 MgCl2 #5-#6 +NaOH +More NaOH +NH3 +More NH3 HCl BaCl2 CuSO4
- 3. Prepared by: Conrad Chong, 2013 Page 3 FeCl3 FeSO4 Al2(SO4)3 CaCl2 CdSO4 SrCl2 MnSO4 Pb(C2H3O2)2 ZnSO4 NiSO4 CoCl2 AgNO3 MgCl2 Color of Solution Color of Solution K2CrO4 Na2CO3 (NH4)2S Na2SO3 Na3PO4 NaOH K2C2O4 NH3 K2Cr2O7 HCl