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April 17, 2014

Homework Help: chemical test

Posted by ~christina~ on Sunday, December 2, 2007 at 6:20pm.

I'm going to do the Baeyer test (Pottasium permanganate)

Instructions say to disslove 25mg of unknown or 2 drops of liquid unknown in 2ml of 95% ethanol. Slowly add 1% aqueous solution (weight/volume) of potassium permanganate, drop by drop with shaking, to the unknown.

In a possitive test, the purple color of the reagent is discharged, and a brown precipitate of manganese dioxide forms, usually within one minute.

My question is, what do they mean by discharge? Do they mean it disappears and the manganese dioxide forms or does it stay and the manganese dioxide forms?

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