The Periodic Law Lab

The Periodic Law Objective: 1. To examine the periodic variation of the density and solubility of compounds within groups of elements. 2. To determine the densities of certain elements in Group IVA. 3. To determine the solubilities of certain salts of Group IIA elements. Safety: 1. Wear safety goggles. Procedure: Part A 1. Determine the mass of samples of tin, lead, and silicon. 2. Determine the volumes of the tin, lead, and silicon samples in step one by the water displacement method. Part B 1. Use a spot plate. To separate “spots”, add about 10 drops of solutions of magnesium nitrate, calcium nitrate, strontium nitrate, and barium nitrate. 2. To each of the “spots” in step 1, add 5 drops of 1 M sulfuric acid. 3. Record your observations. 4. Rinse the spot plate and repeat