Title: What’s in that Bottle?
Objective: To determine the type of bonding in unlabeled chemicals using physical and chemical properties of substances containing iconic, molecular (polar and nonpolar covalent) and metallic bonds.
Potential unknown solids:
Copper (II) Sulfate anhydrous
Sodium Hydrogen Carbonate
Copper (II) Sulfate pentahydrate
Materials for testing:
95% Ethanol 30mL dropper bottle
Small test tubes and rack
Hexanes, 30mL dropper bottle
Phenolphthalein (Dropper Bottle)
Conductivity meter or tester
Distilled Water, 30mL dropper bottle
pH paper and glass rod
Orthodontic Rubber band
Canned food lid
Relevant MSDS for all knowns and unknowns used
0.1M Sodium Hydroxide 30mL dropper Bottle
Corks for Test Tubes
Well plate or micro well plate
O.1M Hydrochloric Acid 30mL dropper bottle
Universal Indicator (Dropper Bottle)
Safety and Disposal: Safety goggles should be worn at all times in the lab. Be cautious of acidic and basic solutions since they can cause skin burns and eye damage. Liquids and solids are to be disposed of in properly labeled waste containers per MSDS guidelines. It is recommended that the lab be done a small scale to minimize solvent and chemical exposure. If hexanes and iodine are used, it is advisable for the teacher to leave these compounds in the hood for student use and to use and exercise appropriate safety precautions.