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This lab will be concerning experimentally determine specific physical and/or chemical properties that are similar in Groups and between Group in a specific row (on the Periodic table). In particular, this lab will focus on the Alkaline Earth Metal elements (Group 2 on Periodic Table) and a few Alkali metal elements (Group 1 on Periodic Table).
Note: There will be a part of this lab students will not perform but instead will be demonstrated by the teacher. Students will write down in their Data (or Observation) table their observation. Specifically, it is the reaction when Lithium metal, Sodium metal, and Potassium metal is added to water.
Directions
This lab is broken into 2 subsection, reactions of specific metals with water and the solubility of metal sulfates. The 2 subsection are separate from each other so this overall lab can be performed different for different as long as each subsection is done completely before starting the other subsection.
Reaction with water (H2O</sub>1</sub>)
1. Obtain a piece of calcium metal and add to a small test of water (about 1/4 - 1/3 filled). Before adding in calcium metal, please a drop of phthalein (it indicates the presence of OH1- ions). This ion is a product of a metal reacting with water (more ions, more reaction). Record your observations.
2. All test tubes will be held with test tube clamps. Invert another small test and hold it over the small test tube with the reaction occurring in it to collect gas that is generated. Then exposed the collect gas to a light match by keeping test tube inverted (do this at least a 1-2 feet from reaction test tube. Make observations.
3. Do the same with a small 1-2cm piece of Magnesium ribbon. If you do not see same results as step above, add the test tube (including metal) into a 250 ml beaker of hot water (since it is on a hot plate). Record your observation include what happened with room temperature water. Will not do check for gas product in this reaction since there is very little gas generated (if I am wrong and there is enough gas generated, use the test above to determine what the gas product is.
4. For both of the above reactions, decant off the solution (students call them liquids) ino the sink and place leftover metal in a container that teacher designated that is under the exhaust hood.
5. Rinse out with tap water the test tube and shake dry. Will be used in the next subsection of the lab.
6. Put back into container any unused and uncontaminated metal solid.
Reaction with water (H2O</sub>1</sub>)