Do not lay down the stopper of bottle . Impurities may be picked up and thus contaminate the solution when the stopper is returned. ... Never pour anything back into a reagent stock bottle – take out only as much as you will use.
Why don’t we set the glass top of a reagent bottle down on the table when pouring liquids?
When you take the top off the reagent bottle, don’t lay it down (risks contamination) . Many solid chemicals can be easily transferred by tipping the bottle and slowly rotating the bottle back and forth. Don’t tip the bottle up high and let the contents pour out.
Should you lay the stopper of a reagent bottle on the lab table?
Never lay the stopper of a reagent bottle on the lab table. ... Never pour reagents back into stock bottles.
Why should we place stoppers or covers of reagent bottles upside down on the table?
Stoppers: To remove a cork, stopper, or lid, do the following: After picking up the stopper, turn it upside down before placing it on the counter top . This will help avoid contaminating the chemical when the stopper is replaced.
Why must reagent bottles be closed when not in use?
Reagent bottles that have been used in a laboratory or otherwise used to store chemicals should not be used for storing food or drinks . When the bottle is then cooled, the neck shrinks around the stopper, locking it in place.
What is the best approach when liquid from a large reagent bottle is needed?
What is generally the best approach when liquid from a large reagent bottle is needed in an experiment? check and see if anyone else can use the chemical . If not, discard in the proper waste container. A student removes a chemical sample from a reagent bottle to be used in an experiment.
Why do we always replace tops of reagent bottles immediately?
Always replacing bottle tops as soon as you have finished dispensing reagents since many compounds react with moisture in the air , with oxygen or with carbon dioxide. Others are volatile and evaporate. ... If you do remove the reagent from the common work area temporarily, replace it as soon as possible.
What should you do once you are done working with a reagent bottle?
What should you do after finishing work with a reagent bottle? Return the bottle to its proper storage location .
When removing a glass stopper from a reagent bottle is it okay to put the stopper on the workbench?
Pouring liquids
1. Use the back of your fingers to remove the stopper from a reagent bottle. Hold the stopper between your fingers until the transfer of liquid is complete. Do not place the stopper on your workbench .
What are three things we should do when we are done with the lab?
- Dress appropriately. Before entering the lab, make sure to put on a lab coat. ...
- Keep a tidy lab. ...
- Know your lab safety symbols. ...
- Handle chemical spills properly. ...
- Know your safety equipment.
What is reagent bottle used for?
The Reagent Bottles, also known as media bottles, are used to store chemicals in liquid or powder form . They are generally made up of glass or plastic.
How do you properly hold a reagent bottle?
Grasp the bottle in both hands with your fingers around the bottle and your thumbs against the edge of the stopper . Push against the edge of the stopper. Rotate the bottle and try again until you feel a small pop. It may take several rotations and “pops” before the lid is loose enough to remove.
What is the purpose of using a reagent bottle?
Reagent bottles, also known as media bottles or graduated bottles, are containers made of glass, plastic, borosilicate or related substances, and topped by special caps or stoppers. They are intended to contain chemicals in liquid or powder form for laboratories and stored in cabinets or on shelves .
Why chemicals that have been used should not go back into the original bottle?
Never return unused chemicals to the reagent bottles.
This is a source of possible contamination of the entire contents of the stock bottle. Dispose of unused chemicals exactly as instructed in the waste disposal instructions for that substance, identified by throughout each experiment.
Why are bottles of chemicals kept tightly closed?
To keep out of chemicals and fire. ... Why are bottles of chemicals kept tightly closed except when a quantity of chemical is being removed? To not have it spill and also to not have other stuff outside come in to the bottle .
What is the last step of any spill cleanup procedure?
What is the last step of any spill cleanup procedure? Wipe down the affected area with detergent and water.
