Why should the crucible be heated initially with the cover off?

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Why should the crucible be heated initially with the cover off?

2006-08-13 04:01:34 · 3 answers · asked by amazing_sweet_angel 1 in Science & Mathematics ➔ Chemistry

3 answers

I actually do this every day. An open crucible allows all the gas and residue to escape that might otherwise contaminate your test. Else it would wind up on the crucible top.

2006-08-13 04:58:33 · answer #1 · answered by AldericII 2 · 1⤊ 0⤋

The intial heating is mostly about removing any excess water that is in the crucible by boiling it off. The lid needs to be removed so the water can be removed into the air.

2006-08-13 05:33:09 · answer #2 · answered by Andrew L 2 · 0⤊ 0⤋

To release gasses that could otherwise build up dangerous pressure...

2006-08-13 04:07:02 · answer #3 · answered by Anonymous · 0⤊ 0⤋