2006-11-28 19:52:28 · 6 answers · asked by juzz 1 in Science & Mathematics ➔ Chemistry
Reagents, since they usually come into contact with other atoms, are easily contaminated. Even by the air, which contains many sub particles and substances that are harmful when interacted with. If they are returned to their original container. Aren't the other atoms of the substance getting contaminated as well? Hence here, there seems to be the problem of contamination and wastage. Hope that helps dear!!!
2006-11-28 20:03:05 · answer #1 · answered by princess 3 · 0⤊ 0⤋
The main reason is the risk of contamination from the intermediary container. The average glass wear container that a lab student would use is not cleaned anywhere near to the degree that the containers that the reagent was created in. Also with some reagents, they do not respond well to pouring actions, and may create alot of heat, splash up and out, or even boil.
2006-11-29 03:56:43 · answer #2 · answered by Jon D 2 · 0⤊ 0⤋
because it is already exposed to the atmosphere and may have been contaminated. so, to keep the reagents in the original container pure or sterile, the unused reagents must not be returned.
2006-11-29 03:56:16 · answer #3 · answered by Sirius 2 · 0⤊ 0⤋
One thing for sure is that the reagents taken out are contaminated not only by the atmosphere but also the apparatus we used. A very good example, sodium or potassium, a very reactive chemical compound that would even react with air or water that is on the apparatus we used to grab them. Some chemical compounds are also easily oxidised into oxide compounds. Reactive chemical compounds such as iron (II) nitrate will be oxidised into iron (III) nitrate once exposed to the atmosphere.
2006-11-29 04:09:51 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Contamination, it's "Chemistry" we work clean !
2006-11-29 04:00:45 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Because they are contaminated.
2006-11-29 03:54:18 · answer #6 · answered by A_Patriot 2 · 0⤊ 1⤋