when we try to seperate dye why we keep it in the watch glass and keep it over boiling water Can't we evaporate it directly?

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Solution

No!
It is because, the dye gets decomposed if it is directly heated on a china dish and we could not be able to separate the ink components so a water bath is used for evaporation process.

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when we try to seperate dye why we keep it in the watch glass and keep it over boiling water Can't we evaporate it directly?

No!It is because, the dye gets decomposed if it is directly heated on a china dish and we could not be able to separate the ink components so a water bath is used for evaporation process.

No!
It is because, the dye gets decomposed if it is directly heated on a china dish and we could not be able to separate the ink components so a water bath is used for evaporation process.