Problem 7 8 Points Qualitative Analysis You have received 8 liquid samples. Those are either aqueous solutions of salts or acids, or pure substances. Four samples contain salt solutions comprising sodium as a cation. Furthermore, you have at your disposal: Sodium sulfide solution (0,1 M) - pH indicator paper „S“ Sodium hydroxide (2M) - 1 empty test tube 12x100 with plug „Na“ Silver nitrate solution (0,1 M) Toothpicks – „Ag“ Barium nitrate solution (0,1 M) Spot test plate – „Ba“ Complete the table based on the results of your analyses. Formula Justification 1 2 3 4 5 6 7 8
Problem 7 8 Points Qualitative Analysis You have received 8 liquid samples. Those are either aqueous solutions of salts or acids, or pure substances. Four samples contain salt solutions comprising sodium as a cation. Furthermore, you have at your disposal: Sodium sulfide solution (0,1 M) - „S“ Sodium hydroxide (2M) - „Na“ Silver nitrate solution (0,1 M) – „Ag“ Barium nitrate solution (0,1 M) – „Ba“ pH indicator paper 1 empty test tube 12x100 with plug Toothpicks Spot test plate Complete the table based on the results of your analyses. Formula Justification 1 2 3 4 5 6 7 8
2018-National-Competition-Tasks-Practical.docx