These elements tend to form 2+ actions and are very reactive. We also ampere these elements to that of lead because lead also forms a 2+ action. We used the chemical property of solubility to observe the periodic trends of the alkaline earth metals. As general rule, reactivity increases as you move down a group in the periodic table. This means in regards to solubility that the more you farther you move down the group the more insoluble the element is when combined with hydroxides, chlorides, bromides, iodides, sulfates, carbonates, and oxalate’s.
My results were consistent with this theory in that the mixtures went from no reaction to forming a precipitate or from forming a light reciprocate too heavy one as the elements moved down the periodic table. The precipitates that were formed gradually changed from a cloudy or milky mixture to a heavy solid precipitate that would settle on the bottom of the test tube. In some instances lead reacted very similarly with the alkaline earth metal but very different in the other reactions such as with iodide. This is due to lead’s position on the periodic table as compared to those of the alkaline earth metals.
The position on the periodic table correlates to an element’s atomic radius, unionization energy, and electron affinity. All of these properties affect an element’s chemical properties such as solubility. A systematic error occurred during my experiment when I observed a reaction between barium and iodide. There should have been no reaction. This error is probably the result of using a test tube that was not cleaned properly prior to combining Baa(NON)2 with Anal. This experiment reinforced the concepts introduced in Chapter 8 of our textbook.
Pre-Lab Questions 1. The names and symbols of the alkaline earth metals encountered in this experiment are: a. Magnesium – MGM . Barium-Baa c. Strontium – Sir d. Calcium -Ca a. The general electron configuration of the alkaline earth metals is [Noble gas]NSA. B. The electron configuration for lead, BP, is [Ex]6s25d104f146p2. C. All the formulas of the oxides formed by the alkaline earth metals and d. ROR lead have the general formula of OR. 3. The general formulas for the following compounds with alkaline earth metals or ERRS a. . ARCH . ARCH lead: Orbs e. F. RACER g. H. i. Racer The general method that was used to examine qualitative solubility in this experiment is observation. Post Lab Questions 1. The solubility of the alkaline earth metals with hydroxides increases as you move down the group; soluble with halides; with sulfates, carbonates and oxalate’s decreases as you move down the group down the group. 2. The solubility between alkaline earth metals and lead with Noah are similar because all of the reactions were either cloudy or milky.
The solubility between alkaline earth metals and lead with Nasal are different because all of the alkaline earth metals are soluble but lead is not. The solubility between alkaline earth metals and lead with Nab are different because all of the alkaline earth metals re soluble but lead is not. The solubility between alkaline earth metals and lead with iodide are different because all of the alkaline earth metals are soluble but lead is not soluble and formed a bright yellow precipitate.