Chemistry Lab Equipment: Extraction Flask Stoppers

What kind of stoppers must be used for the extraction flasks?

1) Rubber stoppers 2) Glass stoppers 3) Metal stoppers 4) Plastic stoppers, Final answer:

Answer:

Generally, glass stoppers are used for extraction flasks in most chemistry experiments due to their resistance to chemicals. However, in experiments where pressure might build up, rubber stoppers can be preferred for safety.

In the field of Chemistry, the type of stopper you should use for extraction flasks largely depends on the experiment and the chemicals in use. Out of the options provided, most extraction procedures often use glass stoppers due to their great resistance against a variety of chemical reagents, especially when using a glass flask. However, it is important to note that for some experiments where there's a possibility of gas evolving, stoppers must be chosen carefully, as glass stoppers might cause an explosion when pressure builds up inside the flask. In such cases, rubber stoppers which allow some degree of pressure escape are preferred due to safety reasons.

Metal stoppers are rarely used in extraction, owing to potential reactions. Plastic stoppers like those made from high-density polyethylene can be used, unless the chemicals could react with it or dissolve it.

It is crucial to understand the properties of different stoppers and evaluate the specific needs of each experiment to ensure safety and efficiency in the lab.