Purpose/Objective

The purpose of this experiment is to identify the periodic trends in the solubility of the alkaline earth metals and compare the results to that of lead

Materials

1. Pencil
2. Lab notebook
3. 5 small test tubes
4. Droppers
Chemicals

1. 0.2 M Mg(NO3)2
2. 0.2 M Ca(NO3)2
3. 0.2 M Sr(NO3)2
4. 0.2 M Ba(NO3)2
5. 0.2 M Pb(NO3)2
6. 1 M NaOH
7. 0.2 M NaBr
8. 0.2 M NaI
9. 0.2 M Na2SO4
10. 0.1 M Na2CO3
11. 0.2 M Na2C2O4
12. 1 M NaCl
Data and Results

Mg(NO3)2 Ca(NO3)2 Sr(NO3)2 Ba(NO3)2 Pb(NO3)2
NaOH Cloudy Milky Cloudy Cloudy Milky
NaCl No reaction No reaction No reaction No reaction Powder
NaBr No reaction No reaction No reaction No reaction Cloudy
NaI No reaction No reaction No reaction …show more content…

RCrO4
4. The general method that was used to examine qualitative solubilities 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 oxalates decreases as you move down the group down the group.
2. The solubilities between alkaline earth metals and lead with NaOH are similar because all of the reactions were either cloudy or milky. The solubilities between alkaline earth metals and lead with NaCl are different because all of the alkaline earth metals are soluble but lead is not. The solubilities between alkaline earth metals and lead with NaBr are different because all of the alkaline earth metals are soluble but lead is not. The solubilities 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. The solubilities of Mg and Ca with SO4 are different because they are soluble but lead is not and solubilities of Sr and Ba are similar to lead. The solubilities between alkaline earth metals and lead with CO3 are similar since all of compounds form some sort of a white precipitate. The solubility of Mg with C2O4 is different from lead because it is soluble but lead is not and solubilities of rest of alkaline earth metals are similar because they all form some sort of white precipitate.