What are two safety practices that need to be done when heating liquids in laboratory glassware?
Heating Safety 1) Turn off heat sources when they are not in use. 2) Point test tubes away from yourself and others when heating substances in them. 3) Use the proper procedures when lighting a Bunsen burner. 4) To avoid burns, do not handle heated glassware or materials directly.
When heating a solution in a test tube the student should?
Always wear safety glasses. Always point the test tube away from any other person in the lab. Heat the test tube being held at an angle so there is a way for the gases produced to escape safely. Heat the test tube at the top of the solution not the bottom where a gas bubble can cause an explosion.
When heating liquids in a test tube you should?
It is important to heat the tube gently and uniformly. Use a medium blue flame and move the test tube around in the flame to heat the entire surface of the tube as evenly as possible. This is important to minimize bumping and cracking.
Which procedure should not be used during the heating of substances in a test tube?
Why should you never point the test tube towards anyone while heating it? Never point a test tube that you are heating at yourself or your neighbor- it may erupt like a geyser. Always pour acids into water, not water into acid, because the heat of solution will cause the water to boil and the acid to spatter.
How do you ensure safety while handling glassware?
When handling hot or cold glassware, always wear insulated gloves….Handle and Store Glassware Safely
- Never force a joint free. It can cause the glass to shatter.
- Lubricate surfaces or use a Teflon sleeve.
- A heat gun can gently loosen the joints.
How do you pour liquids into glassware?
When pouring liquids into glassware , make sure the container you are pouring into is resting on a table at least a hands breadth from the edge. Glassware Safety Glassware Safety 4. Pour down a glass stirring rod to prevent liquids from splattering.
Can test tubes explode?
For example, test tubes can be made to shatter if heated too intensely, or if they’re suddenly brought from a high temperature to a low temperature (such as quenching them in water). One of the most common heating mistakes is to have too much liquid in the test tube.
What is the safest method of heating a solution in a test tube?
Hold the test tube at an angle. Point the test tube away from yourself and all other people. Heat the test tube gently from the top of the substance being heated, and always wear safety googles.
Can you heat liquids in a closed container?
Do not heat a closed container. Pressure build up may cause the container to explode.
What are the safety rules for glassware in the lab?
Glassware is one of the most commonly used kinds of equipment in science laboratories. Follow all lab safety rules when using and handling glassware to avoid accidents and injury. All glassware should be inspected for cracks and contamination before use. Cracked items should be disposed of, and contaminated glassware should be cleaned.
What kind of glassware do you use in a chemistry lab?
The best piece of glassware for this job is the volumetric flask which is used for preparing standard solutions. The bottom is great for dissolving or mixing liquids, and the narrow neck is perfect for the precise measurement of a liquid.
What should you do when heating substances in a lab?
15. When heating substances in a test tube, always point the mouth of the test tube away from yourself and others. 16. Clearly label all containers with the names of the materials you are using. 17. Report all accidents to the teacher immediately, including breakage of materials, chemical spills, and injury. 18.
Is it safe to wash glass in a lab?
This can help prevent potentially dangerous situations from arising and should be a standard practice for every lab scientist. When washing glassware, safety precautions should be taken.