PROPER TEST TUBE USAGE WORKSHEET Where should the test tube rest in a balance? What should you get before you get a test tube? What are the two ways to heat a substance in a test tube? How should you hold a test tube holder? What should you measure chemicals in before you add them to a test tube? CMDMX |
MATERIALS NEEDED TO PROPERLY USE A TEST TUBE -Test Tube Rack: Never leave a test tube on a counter. Always obtain a test tube rack before moving test tubes to your lab station. -Test Tube Holder: This instrument is only necesary when heating a test tube. Never touch a hot test tube. Always use test tube holders. -Glass Stirrer: Use a small glass stirrer to mix solutions in test tubes and always wash the stirrer before and after using it. -Never carry more than one test tube in each hand! -Never use stoppers! MASSING A TEST TUBE -Before making initial measurements, wash out test tube using DI water and dry out completely. -Place the test tube in the notch of the tray on the balance to make sure it does not move and elevate the top of the test tube. HEATING WITH A TEST TUBE -When heating a solution or liquid, always use a hotwater bath unless otherwise instructed. -When heating a solid, use a Bunsen Burner. -To use hot water bath, place a large beaker of water either on a hot plate or over a Bunsen Burner. -Insert test tube in hot water bath with test tube holders attached. -To heat over a Bunsen Burner, hold the test tube over the flame using the test tube holders until the substance is dry. PUTTING SOLUTIONS IN A TEST TUBE -Unless otherwise directed, measure and pour the solution in a graduated cylinder. -To mix solutions, stir using a small glass stirrer or swirl the liquid within the test tube. -If a test tube breaks, inform your teacher and place it in the prper recepticle. -When finished, clean test tube and hand on test tube rack. WorkSheet CMDMX |