The Alkaline Earths and the Halogens: Two Families in the Periodic Table

Experiment 2: The Alkaline Earths and the Halogens: Two Families in the Periodic Table
Lab Report
By: YOU

Introduction: The purpose of this lab was to find the relative solubilities of some salts of the Alkaline Earths and use that information to find the order which they appear in the periodic table; also use that information to efficiently find an unknown alkaline earth halide. Also to find the relative oxidizing powers of the Halogens given and using that information finding the order of the Halogens in the periodic table; also use that information to efficiently find an unknown Halogen.

Experimental Procedure: View pages 25-28 in the lab Manuel.

Data and Observations:
Relative Soluabilites of some Salts in Alkaline Earths

| 1 M Na2CO3 | 1M H2SO4 | 1M (NH4)2C2O4 | 1M K2CrO4 & 1M HC2H3O2 | Ca(NO3)2 | 1/2 clear, 1/2 Milky | Clear | Milky White | Clear yellow hinge | Ba(NO3)2 | Milky White | Milky White | Milky White | Milky Yellow | Mg(NO3)2 | 1/2 clear, 1/2 Milky | Clear | Clear | Clear yellow hinge | Sr(NO3)2 | Milky White | Milky White solid | Milky White | Clear yellow hinge |

**Unknown #8 reacted with 1M H2SO4 and turned Milky White

Oxidizing ability of halogens

| Cl2(Hexane) | Br2(Hexane) | I2(Hexane) | Cl- | x | | | Br- | | x | | I- | | | x |

**** Unknown #8 reacted with Cl2(hexane) which made

Calculations:
Not applicable

Discussion:
In part c of the experiment we were asked to list the 4 alkaline earth metals in the order which they should appear in group 2 of the periodic table based on our observations. I came the conclusion that they should appear as (Mg, Ca, Sr, Ba) from top to bottom respectively. I came to this conclusion since I know mass increases from top to bottom of the periodic table and the reactions with more precipitate and color would have a greater mass. So I observed the Relative Soluabilites of some Salts in Alkaline Earths table and saw that Mg had the least